CVE-2025-52881
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.3 HIGHCVSS: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/M
- EPSS
- 0.56% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-61, CWE-363
- Affected
- linuxfoundation/runc
- Source
- security-advisories@github.com
References
- http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322Patch
- http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3Patch
- https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.mdPatch
- https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557Patch
- https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6dPatch
- https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58Patch
- https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6Patch
- https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651fPatch
- https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544Patch
- https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572dbPatch
- https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28Patch
- https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2Patch
- https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165Patch
- https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64Patch
- https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1Patch
- https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51Patch
- https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480Patch
- https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2Patch, Third Party Advisory
- https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prmExploit, Mitigation, Patch, Third Party Advisory
- https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7rPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.