CVE-2025-31133

Published Nov 6, 2025

Last updated 3 months ago

CVSS high 7.3

Container Security

Overview

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.
Source: security-advisories@github.com
NVD status: Analyzed
Products: runc

Risk scores

CVSS 4.0

Type: Secondary
Base score: 7.3
Impact score: -
Exploitability score: -
Vector string: 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
Severity: HIGH

CVSS 3.1

Type: Primary
Base score: 7.8
Impact score: 6
Exploitability score: 1.1
Vector string: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity: HIGH

Weaknesses

security-advisories@github.com: CWE-61

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "889E52A1-D7B0-4DC8-BD63-9413A1DD9EEB",
            "versionEndExcluding": "1.2.8",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "F3193A96-E882-439B-984E-782315C62F69",
            "versionEndExcluding": "1.3.3",
            "versionStartIncluding": "1.3.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:linuxfoundation:runc:1.4.0:rc1:*:*:*:*:*:*",
            "matchCriteriaId": "082E3496-822B-481B-AC2F-DA8DCAFC28FF",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:linuxfoundation:runc:1.4.0:rc2:*:*:*:*:*:*",
            "matchCriteriaId": "71C62E90-6357-44A4-B582-28B1F1D9B16D",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 4.0

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References