CVE-2025-52881 (GCVE-0-2025-52881)

Vulnerability from cvelistv5 – Published: 2025-11-06 20:23 – Updated: 2025-11-06 21:07
VLAI?
Title
runc: LSM labels can be bypassed with malicious config using dummy procfs files
Summary
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. This issue is fixed in versions 1.2.8, 1.3.3, and 1.4.0-rc.3.
Severity ?
7.3 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE
  • CWE-61 - UNIX Symbolic Link (Symlink) Following
  • CWE-363 - Race Condition Enabling Link Following
Assigner
References
Impacted products
Vendor Product Version
opencontainers runc Affected: <= 1.2.7, < 1.2.8
Affected: <= 1.3.2, < 1.3.3
Affected: <= 1.4.0-rc.2, < 1.4.0-rc.3
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\"https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2\", \"name\": \"https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480\", \"name\": \"https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51\", \"name\": \"https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1\", \"name\": \"https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64\", \"name\": \"https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165\", \"name\": \"https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2\", \"name\": \"https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28\", \"name\": \"https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db\", \"name\": \"https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544\", \"name\": \"https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f\", \"name\": \"https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6\", \"name\": \"https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58\", \"name\": \"https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d\", \"name\": \"https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557\", \"name\": \"https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md\", \"name\": \"https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322\", \"name\": \"http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3\", \"name\": \"http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. This issue is fixed in versions 1.2.8, 1.3.3, and 1.4.0-rc.3.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-61\", \"description\": \"CWE-61: UNIX Symbolic Link (Symlink) Following\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-363\", \"description\": \"CWE-363: Race Condition Enabling Link Following\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2025-11-06T20:23:36.237Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-52881\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-06T21:07:09.382Z\", \"dateReserved\": \"2025-06-20T17:42:25.708Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2025-11-06T20:23:36.237Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.



Detection rules are retrieved from Rulezet.