RHSA-2020:5199
Vulnerability from csaf_redhat - Published: 2020-11-24 10:06 - Updated: 2026-11-07 06:08Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions.
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: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt (CVE-2020-14385)
* kernel: memory corruption in net/packet/af_packet.c leads to elevation of privilege (CVE-2020-14386)
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.
A flaw was found in the Linux kernel. A failure of the file system metadata validator in XFS can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt. This can lead to the filesystem being shutdown, or otherwise rendered inaccessible until it is remounted, leading to a denial of service. The highest threat from this vulnerability is to system availability.
6.2 (Medium)
Affected products
Fixed
47 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:bpftool-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:bpftool-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:bpftool-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:bpftool-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-0:4.18.0-80.31.1.el8_0.src | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-abi-whitelists-0:4.18.0-80.31.1.el8_0.noarch | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-core-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-core-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-core-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-core-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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|
|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-devel-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-devel-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-modules-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-modules-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-modules-extra-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debug-modules-extra-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debuginfo-common-ppc64le-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-debuginfo-common-x86_64-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-devel-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-devel-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-doc-0:4.18.0-80.31.1.el8_0.noarch | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-modules-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-modules-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-modules-extra-0:4.18.0-80.31.1.el8_0.ppc64le | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-modules-extra-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-libs-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:kernel-tools-libs-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:perf-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: BaseOS-8.0.0.Z.E4S:perf-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:perf-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:perf-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:python3-perf-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:python3-perf-0:4.18.0-80.31.1.el8_0.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:python3-perf-debuginfo-0:4.18.0-80.31.1.el8_0.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-8.0.0.Z.E4S:python3-perf-debuginfo-0:4.18.0-80.31.1.el8_0.x86_64 | — |
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Threats
Impact
Important
A flaw was found in the Linux kernel. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
7.8 (High)
Affected products
Fixed
47 products, the same list as for
CVE-2020-14385
Threats
Impact
Important
References
16 references
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"vulnerabilities": [
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"acknowledgments": [
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"names": [
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"organization": "redhat.com"
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"cve": "CVE-2020-14385",
"cwe": {
"id": "CWE-131",
"name": "Incorrect Calculation of Buffer Size"
},
"discovery_date": "2020-08-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1874800"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. A failure of the file system metadata validator in XFS can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt. This can lead to the filesystem being shutdown, or otherwise rendered inaccessible until it is remounted, leading to a denial of service. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Only local users, including unprivileged users in a cointainer, can trigger this flaw. However, the impact could be high, especially on multi-tenant systems, because after the attack the system rendered inaccessible for some time (at least until reboot), so the impact has been increased to Important.",
"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-2020-14385"
},
{
"category": "external",
"summary": "RHBZ#1874800",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1874800"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-14385",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-14385"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14385",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14385"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f4020438fab05364018c91f7e02ebdd192085933",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f4020438fab05364018c91f7e02ebdd192085933"
}
],
"release_date": "2020-08-25T09:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-11-24T10:06:23+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": 6.2,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt"
},
{
"acknowledgments": [
{
"names": [
"Or Cohen"
],
"organization": "paloaltonetworks.com"
}
],
"cve": "CVE-2020-14386",
"cwe": {
"id": "CWE-786",
"name": "Access of Memory Location Before Start of Buffer"
},
"discovery_date": "2020-09-02T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1875699"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: memory corruption in net/packet/af_packet.c leads to elevation of privilege",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Only local users with CAP_NET_RAW capability enabled can trigger this issue.\n\nFor OpenShift Container Platform 4, pods in the default restricted SCC are granted CAP_NET_RAW by default. An attacker can exploit this if they can run arbitrary container images on the target cluster.",
"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-2020-14386"
},
{
"category": "external",
"summary": "RHBZ#1875699",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1875699"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-14386",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-14386"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14386",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14386"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acf69c946233259ab4d64f8869d4037a198c7f06",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acf69c946233259ab4d64f8869d4037a198c7f06"
},
{
"category": "external",
"summary": "https://seclists.org/oss-sec/2020/q3/146",
"url": "https://seclists.org/oss-sec/2020/q3/146"
}
],
"release_date": "2020-09-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-11-24T10:06:23+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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{
"category": "workaround",
"details": "If the CAP_NET_RAW capability disabled by default (which is true for Red Hat Enterprise Linux), then only a privileged user can trigger this bug. The mitigation is to disable CAP_NET_RAW capability for regular users and for executables.\n\nOn Red Hat Enterprise Linux 8 CAP_NET_RAW capability can be also gained by exploiting unprivileged user namespaces. The mitigation is to disable unprivileged user namespaces by setting user.max_user_namespaces to 0:\n\n# echo \"user.max_user_namespaces=0\" \u003e /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf\n\nOpenShift Container Platform 4.5 and 4.4 this can be mitigated by removing `CAP_NET_RAW` from the default cri-o capabilities provided to pods (NOTE: This may prevent `ping` from working in unprivileged pods. This fix has not been validated for OpenShift 4.3 or below):\n```\napiVersion: machineconfiguration.openshift.io/v1\nkind: MachineConfig\nmetadata:\n labels:\n machineconfiguration.openshift.io/role: worker\n name: 50-reset-crio-capabilities\nspec:\n config:\n ignition:\n version: 2.2.0\n storage:\n files:\n - contents:\n source: data:text/plain;charset=utf-8;base64,W2NyaW8ucnVudGltZV0KZGVmYXVsdF9jYXBhYmlsaXRpZXMgPSBbCiAgICAiQ0hPV04iLAogICAgIkRBQ19PVkVSUklERSIsCiAgICAiRlNFVElEIiwKICAgICJGT1dORVIiLAogICAgIlNFVEdJRCIsCiAgICAiU0VUVUlEIiwKICAgICJTRVRQQ0FQIiwKICAgICJORVRfQklORF9TRVJWSUNFIiwKICAgICJTWVNfQ0hST09UIiwKICAgICJLSUxMIiwKXQo=\n filesystem: root\n mode: 0644\n path: /etc/crio/crio.conf.d/reset-crio-capabilities.conf\n```\n\nCreate this MachineConfig object via e.g. `oc apply`. More information about MachineConfig can be found here: \nhttps://github.com/openshift/machine-config-operator\nhttps://docs.openshift.com/container-platform/4.5/architecture/architecture-rhcos.html\n\nIn order to monitor the rollout of this change, use `oc describe machineconfigpool/worker`.\n\nCheck for any pods which start to crash after this is applied; they may need to be adjusted request `CAP_NET_RAW` explicitly. More information:\nhttps://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-capabilities-for-a-container\nhttps://docs.openshift.com/container-platform/4.5/authentication/managing-security-context-constraints.html",
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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: memory corruption in net/packet/af_packet.c leads to elevation of privilege"
}
]
}
Loading…
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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
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.