RHSA-2021:2735
Vulnerability from csaf_redhat - Published: 2021-07-20 21:02 - Updated: 2026-02-19 13:21Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
* kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362)
* kernel: Use after free via PI futex state (CVE-2021-3347)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "1930246"
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{
"category": "description",
"text": "A flaw was found in the Linux kernel. An integer overflow in the firmware for some Intel(R) Graphics Drivers may allow a privileged user to potentially enable an escalation of privilege via local access. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Integer overflow in Intel(R) Graphics Drivers",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Only users that specify i915.enable_guc=-1 or i915.enable_guc=1 or 2 are open to be exploited by this issue.\n\nDue to the full fix (combination of kernel and firmware updates) being invasive and GUC firmware loading is off by default, Red Hat Enterprise Linux kernel versions prior to the Linux kernel version shipped with Red Hat Enterprise Linux 8.4 GA (kernel-4.18.0-305.el8) print a warning in the kernel log (\"GUC firmware is insecure - CVE 2020-12362 - Please update to a newer release to get secure GUC\") and do not rely on the firmware fix. As a result, Red Hat Enterprise Linux versions prior Red Hat Enterprise Linux 8.4 GA (including Red Hat Enterprise Linux 6 and 7) do not include the updated firmware packages.",
"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-2020-12362"
},
{
"category": "external",
"summary": "RHBZ#1930246",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930246"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-12362",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-12362"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-12362",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12362"
}
],
"release_date": "2021-02-17T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-07-20T21:02:15+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: Integer overflow in Intel(R) Graphics Drivers"
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{
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"cwe": {
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"name": "Use After Free"
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"ids": [
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"text": "1922249"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. A use-after-free memory flaw in the Fast Userspace Mutexes functionality allowing a local user to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Use after free via PI futex state",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-3347"
},
{
"category": "external",
"summary": "RHBZ#1922249",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1922249"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3347",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3347"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3347",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3347"
}
],
"release_date": "2021-01-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-07-20T21:02:15+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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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/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: Use after free via PI futex state"
},
{
"acknowledgments": [
{
"names": [
"Qualys Research Team"
]
}
],
"cve": "CVE-2021-33909",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2021-06-10T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1970273"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds write flaw was found in the Linux kernel\u0027s seq_file in the Filesystem layer. This flaw allows a local attacker with a user privilege to gain access to out-of-bound memory, leading to a system crash, leak of internal kernel information and can escalate privileges. The issue results from not validating the size_t-to-int conversion prior to performing operations. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: size_t-to-int conversion vulnerability in the filesystem layer",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Any Red Hat product which relies on the Red Hat Enterprise Linux kernel is also potentially impacted. \nThis includes layered products such as OpenShift Container Platform, OpenStack, Red Hat Virtualization, and others.",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-33909"
},
{
"category": "external",
"summary": "RHBZ#1970273",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970273"
},
{
"category": "external",
"summary": "RHSB-2021-006",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-006"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-33909",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-33909"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-33909",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33909"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/07/20/1",
"url": "https://www.openwall.com/lists/oss-security/2021/07/20/1"
},
{
"category": "external",
"summary": "https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt",
"url": "https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt"
}
],
"release_date": "2021-07-20T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-07-20T21:02:15+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": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: size_t-to-int conversion vulnerability in the filesystem layer"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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