CVE-2025-52881

Nov. 6, 2025, 9:15 p.m.

7.3
High

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.

Product(s) Impacted

Vendor Product Versions
Opencontainers
  • Runc
  • 1.2.7, 1.3.2, <1.4.0-rc.3

Weaknesses

Common security weaknesses mapped to this vulnerability.

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.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a opencontainers runc 1.2.7 / / / / / / /
a opencontainers runc 1.3.2 / / / / / / /
a opencontainers runc <1.4.0-rc.3 / / / / / / /

References

http://github.com/opencontainers/runc/commit/a41366e74080fa9f26a2cd3544e2801449697322
http://github.com/opencontainers/runc/commit/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3
https://github.com/opencontainers/runc/blob/v1.4.0-rc.2/RELEASES.md
https://github.com/opencontainers/runc/commit/3f925525b44d247e390e529e772a0dc0c0bc3557
https://github.com/opencontainers/runc/commit/435cc81be6b79cdec73b4002c0dae549b2f6ae6d
https://github.com/opencontainers/runc/commit/44a0fcf685db051c80b8c269812bb177f5802c58
https://github.com/opencontainers/runc/commit/4b37cd93f86e72feac866442988b549b5b7bf3e6
https://github.com/opencontainers/runc/commit/6fc191449109ea14bb7d61238f24a33fe08c651f
https://github.com/opencontainers/runc/commit/77889b56db939c323d29d1130f28f9aea2edb544
https://github.com/opencontainers/runc/commit/77d217c7c3775d8ca5af89e477e81568ef4572db
https://github.com/opencontainers/runc/commit/b3dd1bc562ed9996d1a0f249e056c16624046d28
https://github.com/opencontainers/runc/commit/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2
https://github.com/opencontainers/runc/commit/d61fd29d854b416feaaf128bf650325cd2182165
https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64
https://github.com/opencontainers/runc/commit/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1
https://github.com/opencontainers/runc/commit/ff6fe1324663538167eca8b3d3eec61e1bd4fa51
https://github.com/opencontainers/runc/commit/ff94f9991bd32076c871ef0ad8bc1b763458e480
https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2
https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm
https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r

Tags

security-advisories@github.com
CWE-61
2025-11-06
CVE-2025-52881

CVSS Score

7.3 / 10

CVSS Data - 4.0

  • Attack Vector: LOCAL
  • Attack Complexity: LOW
  • Attack Requirements: PRESENT
  • Privileges Required: LOW
  • User Interaction: ACTIVE
  • Scope:
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: HIGH
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: Nov. 6, 2025, 9:15 p.m.
Last Modified: Nov. 6, 2025, 9:15 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

security-advisories@github.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.