UNIX symbolic link following in runc - CVE-2026-41579

Vulnerability identifier: #VU134680

CSH Severity: Low

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-41579

CWE-ID: CWE-61

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause limited host filesystem integrity violations.

The vulnerability exists due to unix symbolic link following in setupPtmx and setupDevSymlinks when setting up the container rootfs from a malicious image with /dev as a symlink. A remote attacker can supply a crafted container image to cause limited host filesystem integrity violations.

The issue can delete host files named ptmx or create a fixed set of symlinks in a pre-existing host directory, and user interaction is required to run the crafted image.

runc
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Enterprise Storage
Basesystem Module
openEuler
docker-runc
runc-debuginfo
runc

Install security update from vendor's website.

runc - addressed in versions 1.3.6, 1.4.3, 1.5.0 rc.3
docker-runc - update to 1.0.0 rc3-235
runc-debuginfo - addressed in versions 1.3.6-16.76.1, 1.3.6-150000.101.1
runc - addressed in versions 1.3.6-16.76.1, 1.3.6-150000.101.1

• https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47
• https://github.com/opencontainers/runc/commit/864db8042dbb

• UNIX symbolic link following in runc
• openEuler update for runc
• SUSE update for runc
• SUSE update for runc
• SUSE update for runc
• SUSE update for runc