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CVE-2026-41579

CVE-2026-41579 · runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations

This page contains facts from public vulnerability sources. Check the original advisory before updating.

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.

CVSS 3.3 · Low · EPSS 0.2% · Fix available

Published
Updated

Stack: system · containers

Affected products and versions

  • runc

    Versions
    • < 1.3.6: Affected
    • >= 1.4.0-rc.1, < 1.4.3: Affected
    • >= 1.5.0-rc.1, < 1.5.0-rc.3: Affected

    No fix published

  • runc Debian:12

    Versions
    • 1.1.10+ds1-1
    • 1.1.12+ds1-1
    • 1.1.12+ds1-2
    • 1.1.12+ds1-3
    • 1.1.12+ds1-4
    • 1.1.12+ds1-5
    • 1.1.12+ds1-5.1
    • 1.1.15+ds1-1
    • 1.1.15+ds1-2
    • 1.1.5+ds1-1
    • 1.1.5+ds1-1+deb12u1
    • 1.1.5+ds1-2
    • 1.1.5+ds1-3
    • 1.1.5+ds1-4
    • 1.1.5+ds1-5
    • 1.3.0+ds1-1
    • 1.3.0+ds1-2
    • 1.3.0+ds1-3
    • 1.3.0+ds1-4
    • 1.3.2+ds1-1
    • 1.3.3+ds1-1
    • 1.3.3+ds1-2
    • 1.3.3+ds1-3
    • 1.3.5+ds1-1
    • 1.3.6+ds1-1
    • 1.4.3+ds1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Debian:13

    Versions
    • 1.1.15+ds1-2
    • 1.3.0+ds1-1
    • 1.3.0+ds1-2
    • 1.3.0+ds1-3
    • 1.3.0+ds1-4
    • 1.3.2+ds1-1
    • 1.3.3+ds1-1
    • 1.3.3+ds1-2
    • 1.3.3+ds1-3
    • 1.3.5+ds1-1
    • 1.3.6+ds1-1
    • 1.4.3+ds1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Debian:14

    Versions
    • 1.1.15+ds1-2
    • 1.3.0+ds1-1
    • 1.3.0+ds1-2
    • 1.3.0+ds1-3
    • 1.3.0+ds1-4
    • 1.3.2+ds1-1
    • 1.3.3+ds1-1
    • 1.3.3+ds1-2
    • 1.3.3+ds1-3
    • 1.3.5+ds1-1
    Affected ranges
    • ECOSYSTEM: < 1.3.6+ds1-1

    Update to 1.3.6+ds1-1

  • runc Ubuntu:Pro:16.04:LTS

    Versions
    • 0.0.8+dfsg-2
    • 0.1.1-0ubuntu5~16.04
    • 1.0.0~rc1-0ubuntu1~16.04
    • 1.0.0~rc1-0ubuntu2~16.04.1
    • 1.0.0~rc1-0ubuntu2~16.04.1.1
    • 1.0.0~rc2-0ubuntu2~16.04.1
    • 1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1
    • 1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1
    • 1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.2
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.3
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm1
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:Pro:18.04:LTS

    Versions
    • 1.0.0~rc2+docker1.13.1-0ubuntu1
    • 1.0.0~rc4+dfsg1-2
    • 1.0.0~rc4+dfsg1-6
    • 1.0.0~rc4+dfsg1-6ubuntu0.18.04.1
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.1
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2
    • 1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2+esm1
    • 1.0.0~rc10-0ubuntu1~18.04.1
    • 1.0.0~rc10-0ubuntu1~18.04.2
    • 1.0.0~rc93-0ubuntu1~18.04.1
    • 1.0.0~rc93-0ubuntu1~18.04.2
    • 1.0.0~rc95-0ubuntu1~18.04.1
    • 1.0.0~rc95-0ubuntu1~18.04.2
    • 1.0.1-0ubuntu2~18.04.1
    • 1.1.0-0ubuntu1~18.04.1
    • 1.1.4-0ubuntu1~18.04.1
    • 1.1.4-0ubuntu1~18.04.2
    • 1.1.4-0ubuntu1~18.04.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:20.04:LTS

    Versions
    • 1.0.0~rc8+git20190923.3e425f80-0ubuntu1
    • 1.0.0~rc10-0ubuntu1
    • 1.0.0~rc93-0ubuntu1~20.04.1
    • 1.0.0~rc93-0ubuntu1~20.04.2
    • 1.0.0~rc95-0ubuntu1~20.04.1
    • 1.0.0~rc95-0ubuntu1~20.04.2
    • 1.0.1-0ubuntu2~20.04.1
    • 1.1.0-0ubuntu1~20.04.1
    • 1.1.0-0ubuntu1~20.04.2
    • 1.1.4-0ubuntu1~20.04.1
    • 1.1.4-0ubuntu1~20.04.2
    • 1.1.4-0ubuntu1~20.04.3
    • 1.1.7-0ubuntu1~20.04.1
    • 1.1.7-0ubuntu1~20.04.2
    • 1.1.7-0ubuntu1~20.04.4
    • 1.1.7-0ubuntu1~20.04.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:20.04:LTS

    Versions
    • 1.1.12-0ubuntu2~20.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:22.04:LTS

    Versions
    • 1.0.1-0ubuntu2
    • 1.0.1-0ubuntu3
    • 1.0.3-0ubuntu1
    • 1.1.0-0ubuntu1
    • 1.1.0-0ubuntu1.1
    • 1.1.4-0ubuntu1~22.04.1
    • 1.1.4-0ubuntu1~22.04.2
    • 1.1.4-0ubuntu1~22.04.3
    • 1.1.7-0ubuntu1~22.04.1
    • 1.1.7-0ubuntu1~22.04.2
    • 1.1.7-0ubuntu1~22.04.4
    • 1.1.7-0ubuntu1~22.04.5
    • 1.1.7-0ubuntu1~22.04.6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:22.04:LTS

    Versions
    • 1.1.12-0ubuntu2~22.04.1
    • 1.2.5-0ubuntu1~22.04.1
    • 1.3.0-0ubuntu2~22.04.1
    • 1.3.3-0ubuntu1~22.04.2
    • 1.3.3-0ubuntu1~22.04.3
    • 1.3.4-0ubuntu1~22.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:24.04:LTS

    Versions
    • 1.1.7-0ubuntu2
    • 1.1.10+ds1-1ubuntu1
    • 1.1.10+ds1-1ubuntu2
    • 1.1.12+ds1-1ubuntu1
    • 1.1.12+ds1-2ubuntu1
    • 1.1.12+ds1-2ubuntu1.1
    • 1.1.12+ds1-2ubuntu1.2
    • 1.1.12+ds1-2ubuntu1.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:24.04:LTS

    Versions
    • 1.1.10-0ubuntu1
    • 1.1.12-0ubuntu1
    • 1.1.12-0ubuntu2
    • 1.1.12-0ubuntu3
    • 1.1.12-0ubuntu3.1
    • 1.2.5-0ubuntu1~24.04.1
    • 1.3.0-0ubuntu2~24.04.1
    • 1.3.3-0ubuntu1~24.04.2
    • 1.3.3-0ubuntu1~24.04.3
    • 1.3.4-0ubuntu1~24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:25.10

    Versions
    • 1.1.15+ds1-2ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:25.10

    Versions
    • 1.2.5-0ubuntu1
    • 1.3.0-0ubuntu1
    • 1.3.0-0ubuntu2
    • 1.3.3-0ubuntu1~25.10.2
    • 1.3.3-0ubuntu1~25.10.3
    • 1.3.4-0ubuntu1~25.10.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-stable Ubuntu:25.10

    Versions
    • 1.3.0-0ubuntu1
    • 1.3.3-0ubuntu1~25.10.2
    • 1.3.3-0ubuntu1~25.10.3
    • 1.3.4-0ubuntu1~25.10.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:26.10

    Versions
    • 1.3.3+ds1-2ubuntu1
    • 1.3.5+ds1-1ubuntu1
    • 1.3.6+ds1-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:26.10

    Versions
    • 1.4.0-0ubuntu1
    • 1.5.1-0ubuntu1
    • 1.5.1-0ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-stable Ubuntu:26.10

    Versions
    • 1.3.4-0ubuntu1
    • 1.5.1-0ubuntu1
    • 1.5.1-0ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc Ubuntu:26.04:LTS

    Versions
    • 1.1.15+ds1-2ubuntu1
    • 1.3.3+ds1-2ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-app Ubuntu:26.04:LTS

    Versions
    • 1.3.0-0ubuntu2
    • 1.3.3-0ubuntu1
    • 1.3.3-0ubuntu2
    • 1.4.0-0ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • runc-stable Ubuntu:26.04:LTS

    Versions
    • 1.3.0-0ubuntu1
    • 1.3.3-0ubuntu1
    • 1.3.3-0ubuntu2
    • 1.3.4-0ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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