RHSA-2021:1288
Vulnerability from csaf_redhat - Published: 2021-04-20 15:19 - Updated: 2026-02-19 13:20A locking vulnerability was found in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c. This flaw allows a local attacker to possibly corrupt memory or escalate privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.i686 | — |
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A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. This flaw allows an unprivileged local user to crash the system by exhausting available memory. The highest threat from this vulnerability is to system availability.
| Product | Identifier | Version | Remediation |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.39.1.el6.x86_64 | — |
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A flaw was found in the Linux kernel. An out-of-bounds read was discovered in the libiscsi module that could lead to reading kernel memory or a crash. The highest threat from this vulnerability is to data confidentiality as well as system availability.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-devel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-debuginfo-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-devel-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-debuginfo-0:2.6.32-754.39.1.el6.x86_64 | — |
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A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.src | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-i686-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.39.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.39.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.39.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.39.1.el6.s390x | — |
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"category": "description",
"text": "A locking vulnerability was found in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c. This flaw allows a local attacker to possibly corrupt memory or escalate privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "vendor_fix",
"date": "2021-04-20T15:19:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free"
},
{
"acknowledgments": [
{
"names": [
"Jay Shin"
],
"organization": "Red Hat",
"summary": "This issue was discovered by Red Hat."
}
],
"cve": "CVE-2021-20265",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2020-11-27T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1908827"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. This flaw allows an unprivileged local user to crash the system by exhausting available memory. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: increase slab leak leads to DoS",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-20265"
},
{
"category": "external",
"summary": "RHBZ#1908827",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1908827"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-20265",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20265"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20265",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20265"
}
],
"release_date": "2016-01-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "kernel: increase slab leak leads to DoS"
},
{
"acknowledgments": [
{
"names": [
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],
"organization": "GRIMM"
}
],
"cve": "CVE-2021-27364",
"cwe": {
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"name": "Out-of-bounds Read"
},
"discovery_date": "2021-02-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1930080"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. An out-of-bounds read was discovered in the libiscsi module that could lead to reading kernel memory or a crash. The highest threat from this vulnerability is to data confidentiality as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds read in libiscsi module",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-27364"
},
{
"category": "external",
"summary": "RHBZ#1930080",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930080"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-27364",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27364"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-27364",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27364"
}
],
"release_date": "2021-03-05T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2021:1288"
},
{
"category": "workaround",
"details": "The LIBISCSI module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:\n\n# echo \"install libiscsi /bin/true\" \u003e\u003e /etc/modprobe.d/disable-libiscsi.conf\n\nThe system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.\n\nIf the system requires iscsi to work correctly, this mitigation may not be suitable.\n\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: out-of-bounds read in libiscsi module"
},
{
"acknowledgments": [
{
"names": [
"Adam Nichols"
],
"organization": "GRIMM"
}
],
"cve": "CVE-2021-27365",
"cwe": {
"id": "CWE-788",
"name": "Access of Memory Location After End of Buffer"
},
"discovery_date": "2021-02-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1930078"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: heap buffer overflow in the iSCSI subsystem",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-27365"
},
{
"category": "external",
"summary": "RHBZ#1930078",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930078"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-27365",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27365"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-27365",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27365"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/03/06/1",
"url": "https://www.openwall.com/lists/oss-security/2021/03/06/1"
}
],
"release_date": "2021-03-05T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: heap buffer overflow in the iSCSI subsystem"
}
]
}
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.