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CVE

CVE-2025-52881

runc: LSM labels can be bypassed with malicious config using dummy procfs files
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CVE

CVE-2025-52881

runc: LSM labels can be bypassed with malicious config using dummy procfs files

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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Fix Without Upgrading
Detect compatible fix
Apply safe remediation
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.3
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322, http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3, https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/52xxx/CVE-2025-52881.json, https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md, https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557, https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d, https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58, https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6, https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f, https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544, https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db, https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28, https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2, https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165, https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64, https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1, https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51, https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480, https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2, https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm, https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r, https://nvd.nist.gov/vuln/detail/CVE-2025-52881

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00033%
EPSS Percentile
0.09091%
Introduced Version
0
Fix Available
ff94f9991bd32076c871ef0ad8bc1b763458e480,4:1.3.0-4.el9_7,2:1.41.6-1.el9_7,4:1.2.5-3.el9_6,6:5.6.0-7.el9_7,4:4.9.4-25.module+el8.10.0+23820+ae6deecc,2:1.10.1-2.module+el8.10.0+23820+ae6deecc,2:1.33.13-1.module+el8.10.0+23820+ae6deecc,0:3.18-5.module+el8.10.0+23820+ae6deecc,0:1.13-1.module+el8.10.0+23820+ae6deecc,2:1.10.3-1.module+el8.10.0+23820+ae6deecc,3:2.1.10-1.module+el8.10.0+23820+ae6deecc,0:1.14.3-2.module+el8.10.0+23820+ae6deecc,0:1.2.3-1.module+el8.10.0+23820+ae6deecc,0:0.2.6-21.module+el8.10.0+23820+ae6deecc,0:4.4.0-2.module+el8.10.0+23820+ae6deecc,4:1.2.9-2.module+el8.10.0+23820+ae6deecc,2:1.14.5-5.module+el8.10.0+23820+ae6deecc,0:0.0.99.5-2.module+el8.10.0+23820+ae6deecc,0:84.1-1.module+el8.10.0+23820+ae6deecc,0:4.9.0-3.module+el8.10.0+23820+ae6deecc,2:2.229.0-2.module+el8.10.0+23820+ae6deecc,1:1.4.0-6.module+el8.10.0+23820+ae6deecc,2:1-82.module+el8.10.0+23820+ae6deecc,0:1.2.10-1.module+el8.10.0+23820+ae6deecc,0:3.18-5.module+el8.10.0+23647+cfd78660,0:1.14.3-2.module+el8.10.0+23647+cfd78660,4:4.9.4-23.module+el8.10.0+23647+cfd78660,2:1.14.5-4.module+el8.10.0+23647+cfd78660,3:2.1.10-1.module+el8.10.0+23647+cfd78660,2:1.33.12-2.module+el8.10.0+23647+cfd78660,0:84.1-1.module+el8.10.0+23647+cfd78660,4:1.2.5-2.module+el8.10.0+23647+cfd78660,0:1.2.3-1.module+el8.10.0+23647+cfd78660,2:1-82.module+el8.10.0+23647+cfd78660,0:4.4.0-2.module+el8.10.0+23647+cfd78660,0:1.2.10-1.module+el8.10.0+23647+cfd78660,2:2.229.0-2.module+el8.10.0+23647+cfd78660,1:1.4.0-6.module+el8.10.0+23647+cfd78660,0:0.2.6-21.module+el8.10.0+23647+cfd78660,0:4.9.0-3.module+el8.10.0+23647+cfd78660,0:0.0.99.5-2.module+el8.10.0+23647+cfd78660,0:1.13-1.module+el8.10.0+23647+cfd78660,2:1.10.3-1.module+el8.10.0+23647+cfd78660,2:1.10.1-2.module+el8.10.0+23647+cfd78660,0:1.3.3-0ubuntu1~24.04.2,0:1.3.3-0ubuntu1~22.04.2,1.41.6-r0,5.6.2-r1,1.3.3-r0,1.42.1-r0,5.7.0-r0,2:1.41.6-1.0.1.el9_7,6:5.6.0-7.0.1.el9_7,2:1.10.1-2.module+el8.10.0+90735+426876b9,2:1.33.13-1.module+el8.10.0+90735+426876b9,0:84.1-1.module+el8.10.0+90735+426876b9,3:2.1.10-1.module+el8.10.0+90735+426876b9,2:2.229.0-2.module+el8.10.0+90735+426876b9,1:1.4.0-6.module+el8.10.0+90735+426876b9,2:1-82.0.1.module+el8.10.0+90735+426876b9,0:3.18-5.module+el8.10.0+90735+426876b9,0:1.14.3-2.module+el8.10.0+90735+426876b9,0:1.13-1.module+el8.10.0+90735+426876b9,0:4.4.0-2.module+el8.10.0+90735+426876b9,2:1.10.3-1.module+el8.10.0+90735+426876b9,0:1.2.10-1.module+el8.10.0+90735+426876b9,4:4.9.4-25.0.1.module+el8.10.0+90735+426876b9,0:4.9.0-3.module+el8.10.0+90735+426876b9,4:1.2.9-2.module+el8.10.0+90735+426876b9,2:1.14.5-5.module+el8.10.0+90735+426876b9,0:1.2.3-1.module+el8.10.0+90735+426876b9,0:0.2.6-21.module+el8.10.0+90735+426876b9,2:1.10.1-2.module+el8.10.0+90704+e5ea1250,2:1.33.12-2.module+el8.10.0+90704+e5ea1250,0:84.1-1.module+el8.10.0+90704+e5ea1250,3:2.1.10-1.module+el8.10.0+90704+e5ea1250,2:2.229.0-2.module+el8.10.0+90704+e5ea1250,1:1.4.0-6.module+el8.10.0+90704+e5ea1250,2:1-82.0.1.module+el8.10.0+90704+e5ea1250,0:3.18-5.module+el8.10.0+90704+e5ea1250,0:1.14.3-2.module+el8.10.0+90704+e5ea1250,0:1.13-1.module+el8.10.0+90704+e5ea1250,0:4.4.0-2.module+el8.10.0+90704+e5ea1250,2:1.10.3-1.module+el8.10.0+90704+e5ea1250,0:1.2.10-1.module+el8.10.0+90704+e5ea1250,4:4.9.4-23.0.1.module+el8.10.0+90704+e5ea1250,0:4.9.0-3.module+el8.10.0+90704+e5ea1250,4:1.2.5-2.module+el8.10.0+90704+e5ea1250,2:1.14.5-4.module+el8.10.0+90704+e5ea1250,0:1.2.3-1.module+el8.10.0+90704+e5ea1250,0:0.2.6-21.module+el8.10.0+90704+e5ea1250,0:1.3.3-2.amzn2023.0.1,0:1.3.3-2.amzn2

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