rhsa-2021_2735
Vulnerability from csaf_redhat
Published
2021-07-20 21:02
Modified
2024-11-15 08:43
Summary
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": "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"
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"title": "Vulnerability summary"
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"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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"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"
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"title": "kernel: Integer overflow in Intel(R) Graphics Drivers"
},
{
"cve": "CVE-2021-3347",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2021-01-29T00:00:00+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"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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{
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"baseScore": 7.0,
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"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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"title": "kernel: Use after free via PI futex state"
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{
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{
"names": [
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],
"cve": "CVE-2021-33909",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
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"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"
}
],
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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",
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"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",
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{
"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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"url": "https://access.redhat.com/errata/RHSA-2021:2735"
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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 seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.