CVE-2025-52881
runc: LSM labels can be bypassed with malicious config using dummy procfs files
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Timeline
ID reserved
By GitHub_M
- 5 months later
· 5 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High7.3 | 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 |
| NVDNVD · Analyzed | 4.0 | High7.3 | 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 |
- EPSS (exploitation in 30 days)
- 0.80% · top 43% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.3.
Weakness
Affected products
- 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
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/opencontainers/runcGHSA-cgrx-mc8f-2prm (opens in a new tab)
- Gogithub.com/opencontainers/selinuxGHSA-cgrx-mc8f-2prm (opens in a new tab)
References (20)
- https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm (opens in a new tab)x_refsource_CONFIRM
- https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557 (opens in a new tab)x_refsource_MISC
- https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md (opens in a new tab)x_refsource_MISC
- http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322 (opens in a new tab)x_refsource_MISC
- http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-cgrx-mc8f-2prm (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-52881)Record last updated .