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 v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.1 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522	Patch
https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66	Patch
https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9f	Patch
https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64	Patch
https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2	Mitigation Patch Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:linuxfoundation:runc::::::::
	cpe:2.3:a:linuxfoundation:runc::::::::
	cpe:2.3:a:linuxfoundation:runc:1.4.0:rc1::::::
	cpe:2.3:a:linuxfoundation:runc:1.4.0:rc2::::::

History

No history.

Information

Published : 2025-11-06 19:15

Updated : 2025-12-03 18:30

NVD link : CVE-2025-31133

Mitre link : CVE-2025-31133

CVE.ORG link : CVE-2025-31133

JSON object : View

Products Affected

linuxfoundation

runc

CWE

CWE-61

UNIX Symbolic Link (Symlink) Following

CWE-363

Race Condition Enabling Link Following

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