CVE-2025-31133

Aliases:GHSA-9493-h29p-rfm2GO-2025-4096
Advisory lineage Upstream: 0 Downstream: 47
Analyzed
Published: 06 Nov 2025, 18:47
Last modified:06 Nov 2025, 19:22

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Nov 2025, 18:47
Published
Vulnerability first disclosed
06 Nov 2025, 19:22
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v4.0•HIGH•Score: 7.3CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • v4.0•HIGH•Score: 7.3CVSS: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
  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-61•UNIX Symbolic Link (Symlink) Following

    The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

  • CWE-363•Race Condition Enabling Link Following

    The product checks the status of a file or directory before accessing it, which produces a race condition in which the file can be replaced with a link before the access is performed, causing the product to access the wrong file.

Affected Systems

  • 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

  • linuxfoundation•runc

    < 1.2.8 | ≥ 1.3.0, < 1.3.3 | 1.4.0:rc1 | 1.4.0:rc2

  • opencontainers•runc

    < 1.2.8 | ≥ 1.3.0-rc.1, < 1.3.3 | ≥ 1.4.0-rc.1, ≤ 1.4.0-rc.3

References (7)