CVE-2026-41579

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 v3 3.3 LOW

3.3^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/opencontainers/runc/commit/864db8042dbb	Patch
https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47	Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:linuxfoundation:runc::::::::
	cpe:2.3:a:linuxfoundation:runc::::::::
	cpe:2.3:a:linuxfoundation:runc:1.5.0:rc1::::::
	cpe:2.3:a:linuxfoundation:runc:1.5.0:rc2::::::

History

No history.

Information

Published : 2026-07-01 02:17

Updated : 2026-07-02 19:36

NVD link : CVE-2026-41579

Mitre link : CVE-2026-41579

CVE.ORG link : CVE-2026-41579

JSON object : View

Products Affected

linuxfoundation

runc

CWE

CWE-61

UNIX Symbolic Link (Symlink) Following

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