rhsa-2025:19927
Vulnerability from csaf_redhat
Published
2025-11-07 18:11
Modified
2025-11-08 00:23
Summary
Red Hat Security Advisory: runc security update

Notes

Topic
An update for runc is now available for Red Hat Enterprise Linux 9. 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 runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime. Security Fix(es): * runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133) * runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565) * runc: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881) 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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        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
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          "text": "A flaw was found in runc. This flaw exploits an issue with how masked paths are implementedin runc. When masking files, runc will bind-mount the container\u0027s /dev/null inode on top of the file. However, if an attacker can replace /dev/null with a symlink to some other procfs file, runc will instead bind-mount the symlink target read-write.",
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          "text": "runc: container escape via \u0027masked path\u0027 abuse due to mount race conditions",
          "title": "Vulnerability summary"
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          "text": "Red Hat considers this as an Important flaw since the impact is limited to local attack with minimal privileges in order to jeopardize the environment.",
          "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.",
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-52881",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-52881"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-52881",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52881"
        }
      ],
      "release_date": "2025-11-05T09:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-11-07T18:11:41+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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            "AppStream-9.6.0.Z.MAIN.EUS:runc-4:1.2.5-3.el9_6.ppc64le",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-4:1.2.5-3.el9_6.s390x",
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            "AppStream-9.6.0.Z.MAIN.EUS:runc-4:1.2.5-3.el9_6.x86_64",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debuginfo-4:1.2.5-3.el9_6.aarch64",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debuginfo-4:1.2.5-3.el9_6.ppc64le",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debuginfo-4:1.2.5-3.el9_6.s390x",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debuginfo-4:1.2.5-3.el9_6.x86_64",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debugsource-4:1.2.5-3.el9_6.aarch64",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debugsource-4:1.2.5-3.el9_6.ppc64le",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debugsource-4:1.2.5-3.el9_6.s390x",
            "AppStream-9.6.0.Z.MAIN.EUS:runc-debugsource-4:1.2.5-3.el9_6.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:19927"
        },
        {
          "category": "workaround",
          "details": "Potential mitigations for this issue include:\n\n* Using rootless containers, as doing so will block most of the inadvertent writes (runc would run with reduced privileges, making attempts to write to procfs files ineffective).\n* Based on our analysis, neither AppArmor or SELinux can protect against the full version of the redirected write attack. The container runtime is generally privileged enough to write to arbitrary procfs files, which is more than sufficient to cause a container breakout.",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "runc: opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects"
    }
  ]
}


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