CVE-2025-54867
Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.
Impact
### 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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | youki | < 0.5.5 | 0.5.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Youki-Dev | Youki | before 0.5.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37
- https://github.com/youki-dev/youki/releases/tag/v0.5.5
- https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw
- https://github.com/advisories/GHSA-j26p-6wx7-f3pw
- https://nvd.nist.gov/vuln/detail/CVE-2025-54867