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CVE-2025-54867 — Youki: If /proc and /sys in youki — CVE Details

HIGH

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 August 14, 2025Updated August 14, 2025Source: osv

Summary

### 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

Advisory Timeline

  • First published August 14, 2025 (424 days ago).
  • Last revised August 14, 2025 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update youki to 0.5.5 or later
cargo update -p youki --precise 0.5.5

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
youki
crates.io
All versions0.5.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.0 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is 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. This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.0/10).
How do I check if my project is affected by CVE-2025-54867?
CVE-2025-54867 affects youki. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-54867 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.0

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-j26p-6wx7-f3pw

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