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89 vulnerabilities found for XCP-ng by Vates
MOKSHA-2026-0015
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
VHD Format Flag Corruption via SR.sm_config use_vhd
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can cause complete data loss for all VDIs on an LVHD storage repository by removing the use_vhd key from SR.sm_config. This key determines whether the LVHDSR driver operates in VHD format or raw LV mode. Removing it causes the driver to fall back to raw LV mode on the next PBD plug cycle. VHD-format VDIs accessed in raw mode produce garbage data, and raw-mode writes corrupt VHD metadata structures, resulting in unrecoverable data loss for every VDI on the affected SR.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can cause complete data loss for all VDIs on an LVHD storage repository by removing the use_vhd key from SR.sm_config. This key determines whether the LVHDSR driver operates in VHD format or raw LV mode. Removing it causes the driver to fall back to raw LV mode on the next PBD plug cycle. VHD-format VDIs accessed in raw mode produce garbage data, and raw-mode writes corrupt VHD metadata structures, resulting in unrecoverable data loss for every VDI on the affected SR."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.6,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0015"
}
],
"title": "VHD Format Flag Corruption via SR.sm_config use_vhd"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0015"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0015",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0060
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Arbitrary Integer Passthrough to ionice via VBD.qos_algorithm_params
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can pass arbitrary integer values to the Linux ionice binary via the class key in VBD.qos_algorithm_params. The qos_class parser at xapi_xenops.ml:595-600 accepts any integer via Other(int_of_string s), and Ionice.to_class_param passes Other x directly as the -n argument. No range validation is performed - valid range is 0-7 but negative and extreme values are accepted. Kernel behavior with out-of-range ionice values is undefined. Changes take effect immediately without VBD replug.
Severity
5.3 (Medium)
CWE
- CWE-20 - Improper Input Validation
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can pass arbitrary integer values to the Linux ionice binary via the class key in VBD.qos_algorithm_params. The qos_class parser at xapi_xenops.ml:595-600 accepts any integer via Other(int_of_string s), and Ionice.to_class_param passes Other x directly as the -n argument. No range validation is performed - valid range is 0-7 but negative and extreme values are accepted. Kernel behavior with out-of-range ionice values is undefined. Changes take effect immediately without VBD replug."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0060"
}
],
"title": "Arbitrary Integer Passthrough to ionice via VBD.qos_algorithm_params"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0060"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0060",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0045
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Arbitrary Bond Property Injection via PIF.other_config bond-*
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary bond configuration properties by writing keys with the bond- prefix to PIF.other_config. The nm.ml module extracts any key with the bond- prefix, strips the prefix, and passes the remainder as a bond property override with zero validation on property names or values. This enables bond mode changes, timer manipulation, and injection of invalid parameters causing OVS errors and network disruption.
Severity
6.5 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary bond configuration properties by writing keys with the bond- prefix to PIF.other_config. The nm.ml module extracts any key with the bond- prefix, strips the prefix, and passes the remainder as a bond property override with zero validation on property names or values. This enables bond mode changes, timer manipulation, and injection of invalid parameters causing OVS errors and network disruption."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0045"
}
],
"title": "Arbitrary Bond Property Injection via PIF.other_config bond-*"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0045"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0045",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0026
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Python Module Import Injection via Host.other_config multipathhandle
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject a controlled Python module name via Host.other_config:multipathhandle. The SM driver SR._mpathinit() passes this value to Python __import__() as mpath_<value>. Combined with a file write primitive (provided by BOC-1), an attacker places a malicious .py file in /opt/xensource/sm/ and triggers import as root during the next SR operation. Standalone exploitation requires pool-operator plus an independent file write capability.
Severity
CWE
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject a controlled Python module name via Host.other_config:multipathhandle. The SM driver SR._mpathinit() passes this value to Python __import__() as mpath_\u003cvalue\u003e. Combined with a file write primitive (provided by BOC-1), an attacker places a malicious .py file in /opt/xensource/sm/ and triggers import as root during the next SR operation. Standalone exploitation requires pool-operator plus an independent file write capability."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-913",
"description": "Improper Control of Dynamically-Managed Code Resources",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0026"
}
],
"title": "Python Module Import Injection via Host.other_config multipathhandle"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0026"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0026",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0061
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
I/O Scheduling Downgrade to Idle Class via VBD.qos_algorithm_params
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can downgrade a target VM's I/O scheduling class to idle by setting sched=idle in VBD.qos_algorithm_params. The idle class causes the kernel to service VBD kernel threads only when no other I/O is pending. Under any host I/O load, the target VM experiences severe I/O starvation. The field has zero map_keys_roles entries, and QoS changes take effect immediately via hot-apply without VBD replug.
Severity
5.3 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can downgrade a target VM\u0027s I/O scheduling class to idle by setting sched=idle in VBD.qos_algorithm_params. The idle class causes the kernel to service VBD kernel threads only when no other I/O is pending. Under any host I/O load, the target VM experiences severe I/O starvation. The field has zero map_keys_roles entries, and QoS changes take effect immediately via hot-apply without VBD replug."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0061"
}
],
"title": "I/O Scheduling Downgrade to Idle Class via VBD.qos_algorithm_params"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0061"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0061",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0037
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
VHD Test Mode and Failure Injection via SR.other_config testmode
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can activate VHD failure injection on production storage by setting SR.other_config:testmode to a recognized test mode string. The SM driver matches the value against the ENV_VAR_VHD_TEST dictionary, and matching values cause environment variables to be set that instruct vhd-util to simulate failures during structural VHD operations. The resulting failures leave VHD metadata in an inconsistent state - a targeted data corruption attack indistinguishable from legitimate internal errors.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can activate VHD failure injection on production storage by setting SR.other_config:testmode to a recognized test mode string. The SM driver matches the value against the ENV_VAR_VHD_TEST dictionary, and matching values cause environment variables to be set that instruct vhd-util to simulate failures during structural VHD operations. The resulting failures leave VHD metadata in an inconsistent state - a targeted data corruption attack indistinguishable from legitimate internal errors."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.0,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-489",
"description": "Active Debug Code",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0037"
}
],
"title": "VHD Test Mode and Failure Injection via SR.other_config testmode"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0037"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0037",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0022
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Real-Time I/O Class Abuse via VBD.qos_algorithm_params - Cross-VM Starvation
Summary
A user with the vm-admin role in XAPI-based hypervisors (XenServer, XCP-ng) can set the real-time I/O scheduling class on VBD kernel threads by writing sched=rt and class=highest to VBD.qos_algorithm_params. xenopsd invokes ionice -c1 -n0 on the affected threads, granting strict priority over all best-effort and idle I/O on the host. This starves I/O for every other VM on the same host. The change takes effect immediately without VBD replug and produces no security alert.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A user with the vm-admin role in XAPI-based hypervisors (XenServer, XCP-ng) can set the real-time I/O scheduling class on VBD kernel threads by writing sched=rt and class=highest to VBD.qos_algorithm_params. xenopsd invokes ionice -c1 -n0 on the affected threads, granting strict priority over all best-effort and idle I/O on the host. This starves I/O for every other VM on the same host. The change takes effect immediately without VBD replug and produces no security alert."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.3,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0022"
}
],
"title": "Real-Time I/O Class Abuse via VBD.qos_algorithm_params - Cross-VM Starvation"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0022"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0022",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0025
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Storage Protocol Metadata Poisoning via SR.sm_config (targetIQN/target/LUNid)
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt storage protocol metadata by modifying targetIQN, target, datatype, or LUNid keys in SR.sm_config on iSCSI and HBA storage repositories. These keys are written by the SM driver during SR.create and read back during subsequent operations, but the field remains writable after creation. Modifying LUNid causes VDI operations to target the wrong LUN, enabling cross-SR data corruption. This is an SR-level variant of the SMC-1 storage protocol injection vector.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt storage protocol metadata by modifying targetIQN, target, datatype, or LUNid keys in SR.sm_config on iSCSI and HBA storage repositories. These keys are written by the SM driver during SR.create and read back during subsequent operations, but the field remains writable after creation. Modifying LUNid causes VDI operations to target the wrong LUN, enabling cross-SR data corruption. This is an SR-level variant of the SMC-1 storage protocol injection vector."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0025"
}
],
"title": "Storage Protocol Metadata Poisoning via SR.sm_config (targetIQN/target/LUNid)"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0025"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0025",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0050
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
LUNperVDI Mode Manipulation via SR.sm_config
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt the VDI management mode of a storage repository by adding or removing the LUNperVDI key in SR.sm_config. This key controls whether the SR maps one LUN per VDI or uses shared LUNs with VHD containers. Mode mismatch causes VDI creation, deletion, and scanning failures. The sm_config field has zero map_keys_roles entries and remains writable after SR creation despite being intended as driver-managed metadata.
Severity
5.5 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt the VDI management mode of a storage repository by adding or removing the LUNperVDI key in SR.sm_config. This key controls whether the SR maps one LUN per VDI or uses shared LUNs with VHD containers. Mode mismatch causes VDI creation, deletion, and scanning failures. The sm_config field has zero map_keys_roles entries and remains writable after SR creation despite being intended as driver-managed metadata."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0050"
}
],
"title": "LUNperVDI Mode Manipulation via SR.sm_config"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0050"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0050",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0039
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Filesystem Layout Manipulation via SR.sm_config nosubdir/subdir
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the filesystem layout of NFS and MooseFS storage repositories by modifying the nosubdir or subdir key in SR.sm_config after SR creation. Changing nosubdir causes the driver to look for VDIs in the wrong directory. All VDIs appear missing, causing VM boot failures and complete data inaccessibility for all VMs on the affected SR. The attack is reversible but causes service disruption.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the filesystem layout of NFS and MooseFS storage repositories by modifying the nosubdir or subdir key in SR.sm_config after SR creation. Changing nosubdir causes the driver to look for VDIs in the wrong directory. All VDIs appear missing, causing VM boot failures and complete data inaccessibility for all VMs on the affected SR. The attack is reversible but causes service disruption."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.0,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0039"
}
],
"title": "Filesystem Layout Manipulation via SR.sm_config nosubdir/subdir"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0039"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0039",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0051
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Config Drive Misidentification via VDI.other_config config-drive
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can mark any VDI as a cloud-init config drive by setting config-drive=true in VDI.other_config. The key is defined in xapi_globs.ml as a sync key and consumed during migration and import operations. Guest cloud-init agents misinterpret the flagged VDI's contents as trusted hypervisor-provided metadata, potentially initializing the guest with attacker-controlled configuration.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can mark any VDI as a cloud-init config drive by setting config-drive=true in VDI.other_config. The key is defined in xapi_globs.ml as a sync key and consumed during migration and import operations. Guest cloud-init agents misinterpret the flagged VDI\u0027s contents as trusted hypervisor-provided metadata, potentially initializing the guest with attacker-controlled configuration."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 2.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0051"
}
],
"title": "Config Drive Misidentification via VDI.other_config config-drive"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0051"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0051",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0067
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Cross-Pool Metadata Injection via VDI.xenstore_data on Pool Join
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can poison VDI.xenstore_data on a source pool, and the poisoned metadata crosses into a target pool during pool join or cross-pool migration. The pool join code at xapi_pool.ml:1215 copies VDI records including xenstore_data without re-validation or sanitization. This enables a compromised vm-admin on one pool to inject attacker-controlled storage metadata into a separate, previously uncompromised pool.
Severity
5.3 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can poison VDI.xenstore_data on a source pool, and the poisoned metadata crosses into a target pool during pool join or cross-pool migration. The pool join code at xapi_pool.ml:1215 copies VDI records including xenstore_data without re-validation or sanitization. This enables a compromised vm-admin on one pool to inject attacker-controlled storage metadata into a separate, previously uncompromised pool."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0067"
}
],
"title": "Cross-Pool Metadata Injection via VDI.xenstore_data on Pool Join"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0067"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0067",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0083
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Boot Order Manipulation via VM.HVM_boot_params order
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set an arbitrary boot order string in VM.HVM_boot_params:order. The value is passed verbatim to QEMU as the -boot order argument at device.ml:3957-3958. XAPI performs no validation beyond replacing empty values with the default. QEMU ignores unrecognized characters, limiting impact to forcing PXE network boot when the attacker controls DHCP/PXE infrastructure. The field has zero map_keys_roles entries.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set an arbitrary boot order string in VM.HVM_boot_params:order. The value is passed verbatim to QEMU as the -boot order argument at device.ml:3957-3958. XAPI performs no validation beyond replacing empty values with the default. QEMU ignores unrecognized characters, limiting impact to forcing PXE network boot when the attacker controls DHCP/PXE infrastructure. The field has zero map_keys_roles entries."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 3.1,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0083"
}
],
"title": "Boot Order Manipulation via VM.HVM_boot_params order"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0083"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0083",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0086
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
License Expiry Manipulation via Host.license_params expiry
Summary
An attacker with root access on an XAPI-based hypervisor host (XenServer, XCP-ng) can set the expiry key in Host.license_params to never or a far-future date, preventing license expiry enforcement and suppressing alerts. The license_check.ml code reads this value and treats never as no expiration. The field has the strongest XAPI access control (_R_LOCAL_ROOT_ONLY, pool_internal, DynamicRO). This is a license compliance issue - root access already grants full system control.
Severity
CWE
- CWE-20 - Improper Input Validation
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "An attacker with root access on an XAPI-based hypervisor host (XenServer, XCP-ng) can set the expiry key in Host.license_params to never or a far-future date, preventing license expiry enforcement and suppressing alerts. The license_check.ml code reads this value and treats never as no expiration. The field has the strongest XAPI access control (_R_LOCAL_ROOT_ONLY, pool_internal, DynamicRO). This is a license compliance issue - root access already grants full system control."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 2.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 4.6,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0086"
}
],
"title": "License Expiry Manipulation via Host.license_params expiry"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0086"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0086",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0014
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Local Initiator IQN Injection via PBD.device_config
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can overwrite the host's iSCSI initiator identity by injecting an arbitrary IQN via PBD.device_config:localIQN. The SM driver calls iscsilib.set_IQN() which writes the attacker-supplied value to /etc/iscsi/initiatorname.iscsi. All subsequent iSCSI operations from the host use the spoofed IQN, bypassing storage array access controls based on initiator identity. Enterprise storage arrays commonly use IQN-based ACLs as the primary access control mechanism for iSCSI LUNs.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can overwrite the host\u0027s iSCSI initiator identity by injecting an arbitrary IQN via PBD.device_config:localIQN. The SM driver calls iscsilib.set_IQN() which writes the attacker-supplied value to /etc/iscsi/initiatorname.iscsi. All subsequent iSCSI operations from the host use the spoofed IQN, bypassing storage array access controls based on initiator identity. Enterprise storage arrays commonly use IQN-based ACLs as the primary access control mechanism for iSCSI LUNs."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "Improper Authentication",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0014"
}
],
"title": "Local Initiator IQN Injection via PBD.device_config"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0014"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0014",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0073
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
SR Destruction Protection Bypass and DoS via SR.other_config indestructible
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the indestructible key in SR.other_config to either block SR destruction (DoS - requires direct database manipulation to reverse) or remove destruction protection from a legitimately protected SR (security bypass). The assert_sr_not_indestructible function at xapi_sr.ml:433-442 checks this key before SR.destroy and SR.forget. No map_keys_roles protection exists for infrastructure keys.
Severity
4.9 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the indestructible key in SR.other_config to either block SR destruction (DoS - requires direct database manipulation to reverse) or remove destruction protection from a legitimately protected SR (security bypass). The assert_sr_not_indestructible function at xapi_sr.ml:433-442 checks this key before SR.destroy and SR.forget. No map_keys_roles protection exists for infrastructure keys."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0073"
}
],
"title": "SR Destruction Protection Bypass and DoS via SR.other_config indestructible"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0073"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0073",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0058
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Xenstore Quota Exhaustion via VM.xenstore_data
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can exhaust a guest domain's xenstore quota by injecting a large number of vm-data/* keys into VM.xenstore_data. Xenstore enforces a per-domain quota shared with guest agent data. When injected data consumes the quota, the guest's own xenstore operations fail, disrupting PV drivers, network configuration, and guest agent communication. The field has zero map_keys_roles entries and no value length limits.
Severity
5.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can exhaust a guest domain\u0027s xenstore quota by injecting a large number of vm-data/* keys into VM.xenstore_data. Xenstore enforces a per-domain quota shared with guest agent data. When injected data consumes the quota, the guest\u0027s own xenstore operations fail, disrupting PV drivers, network configuration, and guest agent communication. The field has zero map_keys_roles entries and no value length limits."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0058"
}
],
"title": "Xenstore Quota Exhaustion via VM.xenstore_data"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0058"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0058",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0003
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
System Domain Privilege Escalation via is_system_domain
Summary
A user with the vm-admin role in XAPI-based hypervisors (XenServer, XCP-ng) can promote any VM to system domain status by writing is_system_domain=true to VM.other_config. This key has no per-key RBAC protection. A system-domain VM bypasses VBD sharing constraints (allowing concurrent write access to other VMs' virtual disks), gains access to the query_services operation, and bypasses lifecycle restrictions reserved for XAPI infrastructure components.
Severity
9.9 (Critical)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A user with the vm-admin role in XAPI-based hypervisors (XenServer, XCP-ng) can promote any VM to system domain status by writing is_system_domain=true to VM.other_config. This key has no per-key RBAC protection. A system-domain VM bypasses VBD sharing constraints (allowing concurrent write access to other VMs\u0027 virtual disks), gains access to the query_services operation, and bypasses lifecycle restrictions reserved for XAPI infrastructure components."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.6,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-269",
"description": "Improper Privilege Management",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0003"
}
],
"title": "System Domain Privilege Escalation via is_system_domain"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0003"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0003",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0081
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
I/O Polling Parameter Manipulation via VBD.other_config polling-duration
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set VBD.other_config polling-duration and polling-idle-threshold to extreme values within the partially validated range. xenopsd applies these as I/O polling parameters without resource impact assessment. The accepted range includes values that produce suboptimal polling configurations, resulting in VBD performance degradation. The VBD.other_config field has zero map_keys_roles entries.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set VBD.other_config polling-duration and polling-idle-threshold to extreme values within the partially validated range. xenopsd applies these as I/O polling parameters without resource impact assessment. The accepted range includes values that produce suboptimal polling configurations, resulting in VBD performance degradation. The VBD.other_config field has zero map_keys_roles entries."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 3.1,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0081"
}
],
"title": "I/O Polling Parameter Manipulation via VBD.other_config polling-duration"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0081"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0081",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0029
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
SR-IOV VIF Whitelist Bypass via VIF.other_config
Summary
On SR-IOV-backed VIFs in XAPI-based hypervisors (XenServer, XCP-ng), all VIF.other_config keys bypass the whitelist filter and are written unfiltered to guest-readable xenstore. The standard VIF path (Device.Vif.add) applies a 7-key whitelist; the SR-IOV path (Device.NetSriovVf.add) does not apply this filter. This breaks security equivalence between standard and SR-IOV VIFs, allowing a vm-admin to inject arbitrary key-value pairs into guest-readable xenstore on SR-IOV networks.
Severity
CWE
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "On SR-IOV-backed VIFs in XAPI-based hypervisors (XenServer, XCP-ng), all VIF.other_config keys bypass the whitelist filter and are written unfiltered to guest-readable xenstore. The standard VIF path (Device.Vif.add) applies a 7-key whitelist; the SR-IOV path (Device.NetSriovVf.add) does not apply this filter. This breaks security equivalence between standard and SR-IOV VIFs, allowing a vm-admin to inject arbitrary key-value pairs into guest-readable xenstore on SR-IOV networks."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0029"
}
],
"title": "SR-IOV VIF Whitelist Bypass via VIF.other_config"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0029"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0029",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0062
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Rate Limit Removal via kbps=0 in VIF.qos_algorithm_params
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can silently disable VIF rate limiting by setting kbps=0 in VIF.qos_algorithm_params. XAPI accepts the zero value without validation. xenopsd correctly rejects it at plug time (bytes_per_interval fails the >0L check), but the rejection is invisible - only a debug-level log is emitted. The XAPI database shows rate limiting as configured while xenstore has no rate enforced, creating a false positive for administrators and monitoring tools.
Severity
5.3 (Medium)
CWE
- CWE-20 - Improper Input Validation
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can silently disable VIF rate limiting by setting kbps=0 in VIF.qos_algorithm_params. XAPI accepts the zero value without validation. xenopsd correctly rejects it at plug time (bytes_per_interval fails the \u003e0L check), but the rejection is invisible - only a debug-level log is emitted. The XAPI database shows rate limiting as configured while xenstore has no rate enforced, creating a false positive for administrators and monitoring tools."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0062"
}
],
"title": "Rate Limit Removal via kbps=0 in VIF.qos_algorithm_params"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0062"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0062",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0047
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
DNS Search Domain Injection via PIF.other_config domain
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary DNS search domains into the host resolver configuration by writing to PIF.other_config:domain. The nm.ml module reads this key, splits on commas, and passes the resulting domain list to xcp-networkd with no validation. Injected search domains cause unqualified hostname lookups to resolve through attacker-controlled domains, enabling DNS hijack of internal service discovery.
Severity
6.1 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary DNS search domains into the host resolver configuration by writing to PIF.other_config:domain. The nm.ml module reads this key, splits on commas, and passes the resulting domain list to xcp-networkd with no validation. Injected search domains cause unqualified hostname lookups to resolve through attacker-controlled domains, enabling DNS hijack of internal service discovery."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0047"
}
],
"title": "DNS Search Domain Injection via PIF.other_config domain"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0047"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0047",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0011
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
VIF Backend VM Hijack via Network.other_config backend_vm
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can redirect all VIF traffic on a network through an attacker-controlled VM by setting Network.other_config:backend_vm to a VM UUID they control. XAPI reads this key in xapi_xenops.ml and returns Network.Remote(backend_vm, bridge) instead of Network.Local(bridge) for all subsequent VIF creations on that network. All VMs connected to the network have their traffic routed through the attacker VM, enabling traffic interception, credential sniffing, and man-in-the-middle attacks.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can redirect all VIF traffic on a network through an attacker-controlled VM by setting Network.other_config:backend_vm to a VM UUID they control. XAPI reads this key in xapi_xenops.ml and returns Network.Remote(backend_vm, bridge) instead of Network.Local(bridge) for all subsequent VIF creations on that network. All VMs connected to the network have their traffic routed through the attacker VM, enabling traffic interception, credential sniffing, and man-in-the-middle attacks."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0011"
}
],
"title": "VIF Backend VM Hijack via Network.other_config backend_vm"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0011"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0011",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0028
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
VDI Lifecycle Corruption via VBD.other_config owner Key
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the owner key in VBD.other_config to cause unintended VDI deletion or prevent VDI cleanup during VM uninstall operations. Setting owner on a shared VDI's VBD causes the VDI to be destroyed when the VM is uninstalled, even though other VMs still reference it. Removing the owner key causes VDIs to be orphaned, leading to gradual storage exhaustion. The key has no per-key RBAC protection.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can manipulate the owner key in VBD.other_config to cause unintended VDI deletion or prevent VDI cleanup during VM uninstall operations. Setting owner on a shared VDI\u0027s VBD causes the VDI to be destroyed when the VM is uninstalled, even though other VMs still reference it. Removing the owner key causes VDIs to be orphaned, leading to gradual storage exhaustion. The key has no per-key RBAC protection."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.3,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0028"
}
],
"title": "VDI Lifecycle Corruption via VBD.other_config owner Key"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0028"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0028",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0030
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
XML Injection in Template Provisioning via VM.other_config disks
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can inject crafted XML into VM.other_config:disks, which is parsed via Xml.parse_string during template provisioning. The parser expects a provision/disk structure and extracts device, size, sr, bootable, and type attributes. Malformed XML causes provisioning denial of service. Well-formed but malicious XML enables SR targeting for VDI creation, storage exhaustion via extreme disk sizes, and resource exhaustion via mass VDI specification. The key has no per-key RBAC protection.
Severity
CWE
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can inject crafted XML into VM.other_config:disks, which is parsed via Xml.parse_string during template provisioning. The parser expects a provision/disk structure and extracts device, size, sr, bootable, and type attributes. Malformed XML causes provisioning denial of service. Well-formed but malicious XML enables SR targeting for VDI creation, storage exhaustion via extreme disk sizes, and resource exhaustion via mass VDI specification. The key has no per-key RBAC protection."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-611",
"description": "Improper Restriction of XML External Entity Reference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0030"
}
],
"title": "XML Injection in Template Provisioning via VM.other_config disks"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0030"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0030",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0089
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Raw kbps Value Exposure in Private Xenstore via VIF.qos_algorithm_params
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set VIF.qos_algorithm_params:kbps, which xenopsd writes as a raw Int64.to_string value to the VIF private xenstore path at device.ml:920-927. While Int64.to_string prevents path injection, the raw user-controlled rate values are readable by dom0 processes without provenance tracking. Dom0 tools consuming VIF private xenstore data cannot distinguish between system-generated and attacker-supplied values. The field has zero map_keys_roles entries.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can set VIF.qos_algorithm_params:kbps, which xenopsd writes as a raw Int64.to_string value to the VIF private xenstore path at device.ml:920-927. While Int64.to_string prevents path injection, the raw user-controlled rate values are readable by dom0 processes without provenance tracking. Dom0 tools consuming VIF private xenstore data cannot distinguish between system-generated and attacker-supplied values. The field has zero map_keys_roles entries."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 2.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0089"
}
],
"title": "Raw kbps Value Exposure in Private Xenstore via VIF.qos_algorithm_params"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0089"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0089",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0038
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Provisioning Type Manipulation via SR.sm_config allocation
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt storage provisioning behavior by modifying or removing the allocation key in SR.sm_config after SR creation. The key controls whether LVHD SRs use thin or thick provisioning. Changing allocation from thin to thick causes new VDIs to pre-allocate full LV size instead of thin-provisioning. On overcommitted SRs, this causes immediate storage exhaustion. Restoring the key does not shrink already-inflated LVs - recovery requires storage migration.
Severity
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can corrupt storage provisioning behavior by modifying or removing the allocation key in SR.sm_config after SR creation. The key controls whether LVHD SRs use thin or thick provisioning. Changing allocation from thin to thick causes new VDIs to pre-allocate full LV size instead of thin-provisioning. On overcommitted SRs, this causes immediate storage exhaustion. Restoring the key does not shrink already-inflated LVs - recovery requires storage migration."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 8.3,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0038"
}
],
"title": "Provisioning Type Manipulation via SR.sm_config allocation"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0038"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0038",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0036
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
LVM Configuration Injection via SR.other_config lvm-conf
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary LVM configuration by setting SR.other_config:lvm-conf to a crafted value. The value is interpolated into --config devices{VALUE} in LVM commands executed by SM drivers without sanitization. The LVM --config parameter accepts arbitrary configuration overrides including device filter rules, enabling device filter manipulation that affects which block devices LVM operates on across storage repositories.
Severity
CWE
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can inject arbitrary LVM configuration by setting SR.other_config:lvm-conf to a crafted value. The value is interpolated into --config devices{VALUE} in LVM commands executed by SM drivers without sanitization. The LVM --config parameter accepts arbitrary configuration overrides including device filter rules, enabling device filter manipulation that affects which block devices LVM operates on across storage repositories."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.7,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 7.0,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-88",
"description": "Improper Neutralization of Argument Delimiters in a Command",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0036"
}
],
"title": "LVM Configuration Injection via SR.other_config lvm-conf"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0036"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0036",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0059
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
Multi-Tenant Trust Confusion via VM.xenstore_data
Summary
A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can inject vm-data/* keys into VM.xenstore_data that modify guest behavior across trust boundaries in delegated VM administration environments. Guest OSes treat all vm-data/ entries as trusted hypervisor configuration with no mechanism to distinguish legitimate data from vm-admin-injected data. This enables supply chain attacks via installation source redirection, configuration endpoint hijacking, and credential injection in multi-tenant pools.
Severity
5.3 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A vm-admin in XAPI-based hypervisors (XenServer, XCP-ng) can inject vm-data/* keys into VM.xenstore_data that modify guest behavior across trust boundaries in delegated VM administration environments. Guest OSes treat all vm-data/ entries as trusted hypervisor configuration with no mechanism to distinguish legitimate data from vm-admin-injected data. This enables supply chain attacks via installation source redirection, configuration endpoint hijacking, and credential injection in multi-tenant pools."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0059"
}
],
"title": "Multi-Tenant Trust Confusion via VM.xenstore_data"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0059"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0059",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
MOKSHA-2026-0042
Vulnerability from moksha – Published: 2026-04-24 06:00 – Updated:
VLAI
EPSS
VEX
Title
SMTP Server Redirection / Credential Exfiltration via Pool.other_config
Summary
A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can redirect all pool alert emails through an attacker-controlled SMTP server by writing ssmtp-mailhub and related ssmtp-* keys to Pool.other_config. The mail-alarm script uses these keys as unsanitized macro replacements in the ssmtp configuration template, enabling SMTP server redirection, alert data exfiltration, and potential SMTP credential theft.
Severity
6.5 (Medium)
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Software Group | XenServer |
Affected:
all
(custom)
|
|
| Vates | XCP-ng |
Affected:
all
(custom)
|
{
"containers": {
"cna": {
"affected": [
{
"product": "XenServer",
"vendor": "Cloud Software Group",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
},
{
"product": "XCP-ng",
"vendor": "Vates",
"versions": [
{
"status": "affected",
"version": "all",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jakob Wolffhechel, Moksha"
}
],
"descriptions": [
{
"lang": "en",
"value": "A pool-operator in XAPI-based hypervisors (XenServer, XCP-ng) can redirect all pool alert emails through an attacker-controlled SMTP server by writing ssmtp-mailhub and related ssmtp-* keys to Pool.other_config. The mail-alarm script uses these keys as unsanitized macro replacements in the ssmtp configuration template, enabling SMTP server redirection, alert data exfiltration, and potential SMTP credential theft."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
},
{
"cvssV4_0": {
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T06:00:00Z",
"orgId": "moksha.dk",
"shortName": "Moksha"
},
"references": [
{
"url": "https://cna.moksha.dk/MOKSHA-2026-0042"
}
],
"title": "SMTP Server Redirection / Credential Exfiltration via Pool.other_config"
}
},
"cveMetadata": {
"alternateIds": [
"GCVE-117-2026-0042"
],
"assignerOrgId": "moksha.dk",
"cveId": "MOKSHA-2026-0042",
"datePublished": "2026-04-24T06:00:00Z",
"state": "PUBLISHED",
"x_moksha_note": "Self-issued advisory. MOKSHA-2026-NNNN is not a MITRE CVE ID. Schema follows CVE JSON 5.1 for tooling compatibility. alternateIds contains GCVE cross-references (GNA #117) and will also carry MITRE CVE IDs if assigned."
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}