CVE-2025-31133
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 4.0
- 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 - CVSS 3.1
- 7.8
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS
- 1.2% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-61, CWE-363
- Published
- Modified
- Record from
- the NVD, synced
Affected
- linuxfoundation:runc
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9493-h29p-rfm2 | Go | github.com/opencontainers/runc | <1.2.8 | 1.2.8 |
| GHSA-9493-h29p-rfm2 | Go | github.com/opencontainers/runc | >=1.3.0-rc.1 <1.3.3 | 1.3.3 |
| GHSA-9493-h29p-rfm2 | Go | github.com/opencontainers/runc | >=1.4.0-rc.1 <1.4.0-rc.3 | 1.4.0-rc.3 |
| GO-2025-4096 | Go | github.com/opencontainers/runc | <1.2.8 >=1.3.0-rc.1 <1.3.3 >=1.4.0-rc.1 <1.4.0-rc.3 | 1.2.8, 1.3.3, 1.4.0-rc.3 |
References
- 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://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2