CVE-2025-52881

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, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. 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: 7.5
Impact score: 6
Exploitability score: 0.8
Vector string: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/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