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High ALSA-2025:20957 3 CVEs

Important: runc security update

Published Nov 11, 2025 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime.

Security Fix(es):

* runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133)
* runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565)
* runc: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 1

ReleasePackageFixed in
AlmaLinux · 9 runc 4:1.3.0-4.el9_7

Vulnerabilities 3

  • High 8.4
    CVE-2025-52565

    container escape due to /dev/console mount and related races

    runc is a CLI tool for spawning and running containers according to the OCI specification. Versions 1.0.0-rc3 through 1.2.7, 1.3.0-rc.1 through 1.3.2, and 1.4.0-rc.1 through 1.4.0-rc.2, due to insufficient checks when bind-mounting `/dev/pts/$n` to `/dev/cons…

    opencontainers runc k3s-static-1.32 falco-no-driver Debian Ubuntu Azure Linux Alpine Wolfi Go
  • High 7.3
    CVE-2025-31133 Public exploit

    runc container escape via "masked path" abuse due to mount race conditions

    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…

    opencontainers runc k3s-static-1.32 falco-no-driver Debian Ubuntu Azure Linux Alpine Wolfi Go
  • High 7.3
    CVE-2025-52881 Public exploit

    runc: LSM labels can be bypassed with malicious config using dummy procfs files

    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 s…

    opencontainers runc zot kubescape Debian Ubuntu Azure Linux Alpine Wolfi Go

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-31133
  • report
    https://access.redhat.com/security/cve/CVE-2025-52565
  • report
    https://access.redhat.com/security/cve/CVE-2025-52881
  • report
    https://bugzilla.redhat.com/2404705
  • report
    https://bugzilla.redhat.com/2404708
  • report
    https://bugzilla.redhat.com/2404715
  • advisory
    https://errata.almalinux.org/9/ALSA-2025-20957.html