CVE-2025-54867

HIGH7.0EPSS 0.03%

Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.

Published: 8/14/2025Modified: 8/14/2025
Also known as:GHSA-j26p-6wx7-f3pw

Description

### Summary If `/proc` and `/sys` in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. ### Details For security reasons, container creation should be prohibited if `/proc` or `/sys` in the rootfs is a symbolic link. I verified this behavior with `youki`. When `/proc` or `/sys` is a symbolic link, `runc` fails to create the container, whereas `youki` successfully creates it. This is the fix related to this issue in `runc`. * https://github.com/opencontainers/runc/pull/3756 * https://github.com/opencontainers/runc/pull/3773 * https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590 * https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60 ### Impact The following advisory appears to be related to this vulnerability: * https://github.com/advisories/GHSA-vpvm-3wq2-2wvm * https://github.com/advisories/GHSA-fh74-hm69-rqjw

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1HIGH7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References (5)