rhsa-2023_7554
Vulnerability from csaf_redhat
Published
2023-11-28 17:57
Modified
2024-11-06 04:27
Summary
Red Hat Security Advisory: kpatch-patch security update

Notes

Topic
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8. 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
This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. Security Fix(es): * kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe (CVE-2023-2163) * kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags (CVE-2023-3812) * kernel: use after free in nvmet_tcp_free_crypto in NVMe (CVE-2023-5178) 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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  "vulnerabilities": [
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      "cve": "CVE-2023-2163",
      "cwe": {
        "id": "CWE-682",
        "name": "Incorrect Calculation"
      },
      "discovery_date": "2023-09-20T00:00:00+00:00",
      "ids": [
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          "text": "2240249"
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      "notes": [
        {
          "category": "description",
          "text": "An incorrect verifier pruning flaw was found in BPF in the Linux Kernel that may lead to unsafe code paths incorrectly marked as safe, resulting in arbitrary read/writes in kernel memory, lateral privilege escalation, and container escape.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The Red Hat Enterprise Linux 9.3 not affected, because the required patch applied before this CVE creation. For the Red Hat Enterprise Linux 9 before version 9.3 required fixes applied too.",
          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-2163"
        },
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          "category": "external",
          "summary": "RHBZ#2240249",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2240249"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-2163",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-2163"
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        {
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-2163",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-2163"
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        {
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          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71b547f561247897a0a14f3082730156c0533fed",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71b547f561247897a0a14f3082730156c0533fed"
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      "release_date": "2023-04-19T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2023-11-28T17:57:56+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",
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        {
          "category": "workaround",
          "details": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\n\nFor Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command:\n\n# cat /proc/sys/kernel/unprivileged_bpf_disabled\n\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.",
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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