CVE-2025-52881
runc: LSM labels can be bypassed with malicious config using dummy procfs files
At a glance
- Severity
- HIGH 7.3
- EPSS
- EPSS 0.80 % · percentile 56 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | HIGH 7.3 | 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 | GitHub_M |
| CVSS 4.0 | HIGH 7.3 | 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 | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
Weaknesses (CWE)
Advisories
- GHSA-cgrx-mc8f-2prm — runc container escape and denial of service due to arbitrary write gadgets and procfs write redirects
- GO-2025-4098 — Container escape and DDoS due to arbitrary write gadgets and procfs write redirects in github.com/opencontainers/runc
European references
- ENISA EUVD · EUVD-2025-37940
- GCVE · GCVE-0-2025-52881
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0627 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0326 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0316 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0249 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0218 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0209 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0199 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0112 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-1138 — Multiples vulnérabilités dans VMware Tanzu Platform · cert.ssi.gouv.fr
- CERTFR-2025-AVI-1129 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-1036 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*< 1.2.8cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*≥ 1.3.0 < 1.3.3cpe:2.3:a:linuxfoundation:runc:1.4.0:rc1:*:*:*:*:*:*cpe:2.3:a:linuxfoundation:runc:1.4.0:rc2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| 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 |
References
- https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm
- https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r
- https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2
- https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480
- https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51
- https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1
- https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64
- https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165
- https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2
- https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28
- https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db
- https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544
- https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f
- https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6
- https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58
- https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d
- https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557
- https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md
- http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322
- http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |