CVE-2025-31133
CVE-2025-31133 · runc container escape via "masked path" abuse due to mount race conditions
This page contains facts from public vulnerability sources. Check the original advisory before updating.
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container's /dev/null) was actually a real /dev/null inode when using the container's /dev/null to mask. This exposes two methods of attack: an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.
CVSS 7.3 · High · EPSS 0.8% · Fix available
- Published
- Updated
Stack: system · containers
Affected products and versions
runc
- Versions
- < 1.2.8: Affected
- >= 1.3.0-rc.1, < 1.3.3: Affected
- >= 1.4.0-rc.1, <= 1.4.0-rc.3: Affected
No fix published
runc Debian:12
- Versions
- 1.1.10+ds1-1
- 1.1.12+ds1-1
- 1.1.12+ds1-2
- 1.1.12+ds1-3
- 1.1.12+ds1-4
- 1.1.12+ds1-5
- 1.1.12+ds1-5.1
- 1.1.15+ds1-1
- 1.1.15+ds1-2
- 1.1.5+ds1-1
- 1.1.5+ds1-1+deb12u1
- 1.1.5+ds1-2
- 1.1.5+ds1-3
- 1.1.5+ds1-4
- 1.1.5+ds1-5
- 1.3.0+ds1-1
- 1.3.0+ds1-2
- 1.3.0+ds1-3
- 1.3.0+ds1-4
- 1.3.2+ds1-1
- 1.3.3+ds1-1
- 1.3.3+ds1-2
- 1.3.3+ds1-3
- 1.3.5+ds1-1
- 1.3.6+ds1-1
- 1.4.3+ds1-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc Debian:13
- Versions
- 1.1.15+ds1-2
- 1.3.0+ds1-1
- 1.3.0+ds1-2
- 1.3.0+ds1-3
- 1.3.0+ds1-4
- 1.3.2+ds1-1
- 1.3.3+ds1-1
- 1.3.3+ds1-2
- 1.3.3+ds1-3
- 1.3.5+ds1-1
- 1.3.6+ds1-1
- 1.4.3+ds1-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc Debian:14
- Versions
- 1.1.15+ds1-2
- 1.3.0+ds1-1
- 1.3.0+ds1-2
- 1.3.0+ds1-3
- 1.3.0+ds1-4
- 1.3.2+ds1-1
- 1.3.3+ds1-1
- Affected ranges
- ECOSYSTEM: < 1.3.3+ds1-2
Update to 1.3.3+ds1-2
runc Ubuntu:Pro:16.04:LTS
- Versions
- 0.0.8+dfsg-2
- 0.1.1-0ubuntu5~16.04
- 1.0.0~rc1-0ubuntu1~16.04
- 1.0.0~rc1-0ubuntu2~16.04.1
- 1.0.0~rc1-0ubuntu2~16.04.1.1
- 1.0.0~rc2-0ubuntu2~16.04.1
- 1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1
- 1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1
- 1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.2
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.3
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm1
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc Ubuntu:Pro:18.04:LTS
- Versions
- 1.0.0~rc2+docker1.13.1-0ubuntu1
- 1.0.0~rc4+dfsg1-2
- 1.0.0~rc4+dfsg1-6
- 1.0.0~rc4+dfsg1-6ubuntu0.18.04.1
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.1
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2
- 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2+esm1
- 1.0.0~rc10-0ubuntu1~18.04.1
- 1.0.0~rc10-0ubuntu1~18.04.2
- 1.0.0~rc93-0ubuntu1~18.04.1
- 1.0.0~rc93-0ubuntu1~18.04.2
- 1.0.0~rc95-0ubuntu1~18.04.1
- 1.0.0~rc95-0ubuntu1~18.04.2
- 1.0.1-0ubuntu2~18.04.1
- 1.1.0-0ubuntu1~18.04.1
- 1.1.4-0ubuntu1~18.04.1
- 1.1.4-0ubuntu1~18.04.2
- 1.1.4-0ubuntu1~18.04.2+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc Ubuntu:20.04:LTS
- Versions
- 1.0.0~rc8+git20190923.3e425f80-0ubuntu1
- 1.0.0~rc10-0ubuntu1
- 1.0.0~rc93-0ubuntu1~20.04.1
- 1.0.0~rc93-0ubuntu1~20.04.2
- 1.0.0~rc95-0ubuntu1~20.04.1
- 1.0.0~rc95-0ubuntu1~20.04.2
- 1.0.1-0ubuntu2~20.04.1
- 1.1.0-0ubuntu1~20.04.1
- 1.1.0-0ubuntu1~20.04.2
- 1.1.4-0ubuntu1~20.04.1
- 1.1.4-0ubuntu1~20.04.2
- 1.1.4-0ubuntu1~20.04.3
- 1.1.7-0ubuntu1~20.04.1
- 1.1.7-0ubuntu1~20.04.2
- 1.1.7-0ubuntu1~20.04.4
- 1.1.7-0ubuntu1~20.04.5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc-app Ubuntu:20.04:LTS
- Versions
- 1.1.12-0ubuntu2~20.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc Ubuntu:22.04:LTS
- Versions
- 1.0.1-0ubuntu2
- 1.0.1-0ubuntu3
- 1.0.3-0ubuntu1
- 1.1.0-0ubuntu1
- 1.1.0-0ubuntu1.1
- 1.1.4-0ubuntu1~22.04.1
- 1.1.4-0ubuntu1~22.04.2
- 1.1.4-0ubuntu1~22.04.3
- 1.1.7-0ubuntu1~22.04.1
- 1.1.7-0ubuntu1~22.04.2
- 1.1.7-0ubuntu1~22.04.4
- 1.1.7-0ubuntu1~22.04.5
- 1.1.7-0ubuntu1~22.04.6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc-app Ubuntu:22.04:LTS
- Versions
- 1.1.12-0ubuntu2~22.04.1
- 1.2.5-0ubuntu1~22.04.1
- 1.3.0-0ubuntu2~22.04.1
- Affected ranges
- ECOSYSTEM: < 1.3.3-0ubuntu1~22.04.2
Update to 1.3.3-0ubuntu1~22.04.2
runc Ubuntu:24.04:LTS
- Versions
- 1.1.7-0ubuntu2
- 1.1.10+ds1-1ubuntu1
- 1.1.10+ds1-1ubuntu2
- 1.1.12+ds1-1ubuntu1
- 1.1.12+ds1-2ubuntu1
- 1.1.12+ds1-2ubuntu1.1
- 1.1.12+ds1-2ubuntu1.2
- 1.1.12+ds1-2ubuntu1.3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc-app Ubuntu:24.04:LTS
- Versions
- 1.1.10-0ubuntu1
- 1.1.12-0ubuntu1
- 1.1.12-0ubuntu2
- 1.1.12-0ubuntu3
- 1.1.12-0ubuntu3.1
- 1.2.5-0ubuntu1~24.04.1
- 1.3.0-0ubuntu2~24.04.1
- Affected ranges
- ECOSYSTEM: < 1.3.3-0ubuntu1~24.04.2
Update to 1.3.3-0ubuntu1~24.04.2
runc Ubuntu:25.10
- Versions
- 1.1.15+ds1-2ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
runc-app Ubuntu:25.10
- Versions
- 1.2.5-0ubuntu1
- 1.3.0-0ubuntu1
- 1.3.0-0ubuntu2
- Affected ranges
- ECOSYSTEM: < 1.3.3-0ubuntu1~25.10.2
Update to 1.3.3-0ubuntu1~25.10.2
runc-stable Ubuntu:25.10
- Versions
- 1.3.0-0ubuntu1
- Affected ranges
- ECOSYSTEM: < 1.3.3-0ubuntu1~25.10.2
Update to 1.3.3-0ubuntu1~25.10.2
Original sources
- https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2
- https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522
- https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66
- https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9f
- https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64
- https://nvd.nist.gov/vuln/detail/CVE-2025-31133