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CERTFR-2026-AVI-0942
Vulnerability from certfr_avis - Published: 2026-07-29 - Updated: 2026-07-29
De multiples vulnérabilités ont été découvertes dans Xen. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||||||||||||||
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{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen toutes versions sans le dernier correctif de s\u00e9curit\u00e9",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-62429",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62429"
},
{
"name": "CVE-2026-62423",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62423"
},
{
"name": "CVE-2026-42492",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42492"
},
{
"name": "CVE-2026-42495",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42495"
},
{
"name": "CVE-2026-62427",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62427"
},
{
"name": "CVE-2026-62424",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62424"
},
{
"name": "CVE-2026-62426",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62426"
},
{
"name": "CVE-2026-62428",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62428"
},
{
"name": "CVE-2026-62436",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62436"
},
{
"name": "CVE-2026-42493",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42493"
},
{
"name": "CVE-2026-62434",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62434"
},
{
"name": "CVE-2026-62433",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62433"
},
{
"name": "CVE-2026-62432",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62432"
},
{
"name": "CVE-2026-62430",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62430"
},
{
"name": "CVE-2026-42494",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42494"
},
{
"name": "CVE-2026-62435",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62435"
},
{
"name": "CVE-2026-62431",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62431"
},
{
"name": "CVE-2026-62425",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62425"
}
],
"initial_release_date": "2026-07-29T00:00:00",
"last_revision_date": "2026-07-29T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0942",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-07-29T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-495",
"url": "https://xenbits.xen.org/xsa/advisory-495.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-501",
"url": "https://xenbits.xen.org/xsa/advisory-501.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-504",
"url": "https://xenbits.xen.org/xsa/advisory-504.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-500",
"url": "https://xenbits.xen.org/xsa/advisory-500.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-499",
"url": "https://xenbits.xen.org/xsa/advisory-499.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-508",
"url": "https://xenbits.xen.org/xsa/advisory-508.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-496",
"url": "https://xenbits.xen.org/xsa/advisory-496.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-506",
"url": "https://xenbits.xen.org/xsa/advisory-506.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-507",
"url": "https://xenbits.xen.org/xsa/advisory-507.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-503",
"url": "https://xenbits.xen.org/xsa/advisory-503.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-505",
"url": "https://xenbits.xen.org/xsa/advisory-505.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-502",
"url": "https://xenbits.xen.org/xsa/advisory-502.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-497",
"url": "https://xenbits.xen.org/xsa/advisory-497.html"
}
]
}
CVE-2026-42492 (GCVE-0-2026-42492)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 16:33
VLAI
EPSS
VEX
Title
vIRQ event channel binding may break Xenstore
Summary
Xenstore, to have an up-to-date picture of the entire system, wants to
know of domains appearing and disappearing. To make this more robust, a
new XEN_DOMCTL_get_domain_state was introduced. The management of the
bitmap underlying that operation is tied into the binding of the
VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear
down the bitmap even in cases when it wasn't set up. Unprivileged domains
can trigger that error path.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:56 UTC
CWE
- CWE-459 - Incomplete Cleanup
Assigner
References
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:22.683Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-496.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/13"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42492",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:56:49.876014Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-459",
"description": "CWE-459 Incomplete Cleanup",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:56:54.437Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-496"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "Xen 4.21 and onwards are vulnerable. Xen 4.20 and older are not\nvulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Grygorii Strashko of EPAM."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing. To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced. The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn\u0027t set up. Unprivileged domains\ncan trigger that error path."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "An unprivileged domain can affect the operation of Xenstore, potentially\nleading to a Denial of Service (DoS) affecting the entire host. A\nhypervisor crash with similar host wide effect also is possible, albeit\nunlikely."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:28.304Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-496.html"
}
],
"title": "vIRQ event channel binding may break Xenstore",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-42492",
"datePublished": "2026-07-28T12:31:28.304Z",
"dateReserved": "2026-04-27T14:20:24.139Z",
"dateUpdated": "2026-07-28T16:33:22.683Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42493 (GCVE-0-2026-42493)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 16:33
VLAI
EPSS
VEX
Title
x86 shadow paging is deprecated
Summary
Addressing certain issues, in particular related to operations which may
take excessively long and therefore would need preemption, has turned out
overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly
available, the decision was to deprecate the functionality, while still
retaining it for people to use at their own (security) risk. Memory-wise
small enough guests may still be okay to run.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:58 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:23.792Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-495.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/12"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42493",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:58:19.075241Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400 Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:58:45.484Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-495"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All x86 systems with builds of Xen having SHADOW_PAGING=y are affected.\nNote that prior to Xen 4.7 this control didn\u0027t exist, and all builds of\nXen would be affected. (Strictly speaking Xen 4.6 had a different, harder\nto use mechanism to disable shadow paging support: One could pass\n\"shadow-paging=n\" on the make command line.)"
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk. Memory-wise\nsmall enough guests may still be okay to run."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "An unprivileged guest may be able to cause Denial of Service (DoS)\naffecting the entire host."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:11.950Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-495.html"
}
],
"title": "x86 shadow paging is deprecated",
"workarounds": [
{
"lang": "en",
"value": "Running HVM and PVH in Hardware Assisted Paging (HAP) mode will avoid this\nvulnerability.\n\nThere\u0027s no mitigation available for PV guests. This is because shadow\nmode, if support is enabled in the hypervisor, could be engaged at any\ntime. Note that without shadow mode built into Xen, guests not properly\ndealing with L1TF will simply be crashed instead."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-42493",
"datePublished": "2026-07-28T12:31:11.950Z",
"dateReserved": "2026-04-27T14:20:24.139Z",
"dateUpdated": "2026-07-28T16:33:23.792Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42494 (GCVE-0-2026-42494)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:04
VLAI
EPSS
VEX
Title
buffer overruns in libfsimage iso9660 handling
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:04 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
1 reference
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42494",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:04:14.686627Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:04:48.405Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
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}
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CVE-2026-42495 (GCVE-0-2026-42495)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:01
VLAI
EPSS
VEX
Title
buffer overruns in libfsimage iso9660 handling
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:00 UTC
CWE
- CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
1 reference
Date Public
2026-07-28 12:00
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"title": "CISA ADP Vulnrichment"
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}
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}
]
}
],
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},
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}
CVE-2026-62423 (GCVE-0-2026-62423)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 14:51
VLAI
EPSS
VEX
Title
buffer overruns in libfsimage iso9660 handling
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 14:49 UTC
CWE
- CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
1 reference
Date Public
2026-07-28 12:00
{
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}
},
{
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},
{
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{
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}
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}
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}
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},
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}
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],
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}
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}
]
}
],
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CVE-2026-62424 (GCVE-0-2026-62424)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 14:53
VLAI
EPSS
VEX
Title
buffer overruns in libfsimage iso9660 handling
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 14:53 UTC
CWE
- CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
1 reference
Date Public
2026-07-28 12:00
{
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},
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}
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{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.862Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
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}
]
}
},
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"state": "PUBLISHED"
},
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CVE-2026-62425 (GCVE-0-2026-62425)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:40
VLAI
EPSS
VEX
Title
buffer overruns in libfsimage iso9660 handling
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:40 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
Date Public
2026-07-28 12:00
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}
},
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}
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}
],
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{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
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{
"lang": "en",
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}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
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"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62425",
"datePublished": "2026-07-28T12:31:41.918Z",
"dateReserved": "2026-07-14T10:28:12.654Z",
"dateUpdated": "2026-07-28T15:40:37.904Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62426 (GCVE-0-2026-62426)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:55
VLAI
EPSS
VEX
Title
sysctl and platform-op locks open to abuse
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To manage the system, sysctl and platform operations are used by the
control domain or a possible Xenstore domain. Some of these operations
may not be executed in parallel, so a system-wide lock each is used.
The way those locks are acquired is, however, not providing any fairness.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.
The sysctl issue is CVE-2026-62426.
The platform-op issue is CVE-2026-62427.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:55 UTC
Assigner
References
1 reference
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62426",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:55:06.523957Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-667",
"description": "CWE-667 Improper Locking",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-412",
"description": "CWE-412 Unrestricted Externally Accessible Lock",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:55:11.598Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-499"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.0 onwards are vulnerable. Earlier versions use\na different locking operation, but may also be vulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Jan Beulich of SUSE."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain. Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:57.586Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-499.html"
}
],
"title": "sysctl and platform-op locks open to abuse",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62426",
"datePublished": "2026-07-28T12:31:57.586Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T15:55:11.598Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62427 (GCVE-0-2026-62427)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:54
VLAI
EPSS
VEX
Title
sysctl and platform-op locks open to abuse
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To manage the system, sysctl and platform operations are used by the
control domain or a possible Xenstore domain. Some of these operations
may not be executed in parallel, so a system-wide lock each is used.
The way those locks are acquired is, however, not providing any fairness.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.
The sysctl issue is CVE-2026-62426.
The platform-op issue is CVE-2026-62427.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:54 UTC
Assigner
References
1 reference
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62427",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:54:13.421567Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-284",
"description": "CWE-284 Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-305",
"description": "CWE-305 Authentication Bypass by Primary Weakness",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:54:19.508Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-499"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.0 onwards are vulnerable. Earlier versions use\na different locking operation, but may also be vulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Jan Beulich of SUSE."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain. Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:57.645Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-499.html"
}
],
"title": "sysctl and platform-op locks open to abuse",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62427",
"datePublished": "2026-07-28T12:31:57.645Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T15:54:19.508Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62428 (GCVE-0-2026-62428)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:32 – Updated: 2026-07-28 16:33
VLAI
EPSS
VEX
Title
grant-table: type confusion in grant-copy
Summary
When grant-copy operations are processed, the respective grant may or may
not already be in use by another operation (a mapping or another copy).
For all copy operations the referenced guest frame is looked up. When
another operation is already active for the grant (the grant is "pinned"),
what is being supplied back to actually carry out permission checks and
copy operation may not be consistent: The permission check may be carried
out on a page different from the one involved in the copy.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 15:10 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Date Public
2026-07-28 12:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:28.183Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-500.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/16"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62428",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:10:28.542416Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-367",
"description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:10:53.004Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-500"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.2 onwards are vulnerable. Xen versions 4.1 and\nearlier are not vulnerable.\n\nXen versions 4.13 and newer offer a way to build Xen without grant table\nsupport. Such hypervisors (CONFIG_GRANT_TABLE turned off) are not\nvulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Roman S."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "When grant-copy operations are processed, the respective grant may or may\nnot already be in use by another operation (a mapping or another copy).\nFor all copy operations the referenced guest frame is looked up. When\nanother operation is already active for the grant (the grant is \"pinned\"),\nwhat is being supplied back to actually carry out permission checks and\ncopy operation may not be consistent: The permission check may be carried\nout on a page different from the one involved in the copy."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "An unprivileged guest may be able to elevate its privileges to that of the\nhost. Information leaks and Denial of Service (DoS) are possible as well."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:32:07.573Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-500.html"
}
],
"title": "grant-table: type confusion in grant-copy",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62428",
"datePublished": "2026-07-28T12:32:07.573Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T16:33:28.183Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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