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OpenAdvisories
High USN-7851-1 3 CVEs

runc-app, runc-stable vulnerabilities

Published Nov 4, 2025 · Updated Feb 10, 2026

Ecosystem: Ubuntu

Summary

Lei Wang and Li Fubang discovered that runC incorrectly handled masked
paths. An attacker could possibly replace a container's /dev/null
with a symlink to some other procfs file and possibly escape a container.
(CVE-2025-31133)

Lei Wang and Li Fubang discovered that runC incorrectly handled the
/dev/console bind-mounts. An attacker could potentially exploit this issue
to build-mount a symlink and escape a container. (CVE-2025-52565)

Li Fubang and Tõnis Tiigi discovered that the fix for CVE-2019-16884 was
incomplete. An attacker could possibly use this issue to cause a denial of
service or escape the container. (CVE-2025-52881)

Fixed packages 4

ReleasePackageFixed in
Ubuntu · 22.04 LTS 22.04:LTS runc-app 1.3.3-0ubuntu1~22.04.2
Ubuntu · 24.04 LTS 24.04:LTS runc-app 1.3.3-0ubuntu1~24.04.2
Ubuntu · 25.10 runc-app 1.3.3-0ubuntu1~25.10.2
Ubuntu · 25.10 runc-stable 1.3.3-0ubuntu1~25.10.2

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://ubuntu.com/security/CVE-2025-31133
  • report
    https://ubuntu.com/security/CVE-2025-52565
  • report
    https://ubuntu.com/security/CVE-2025-52881