CVE-2025-62596

Impact

### Impact ### youki’s apparmor handling performs insufficiently strict write-target validation, which—combined with path substitution during pathname resolution—can allow writes to unintended procfs locations. **Weak write-target check** youki only verifies that the destination lies somewhere under procfs. As a result, a write intended for `/proc/self/attr/apparmor/exec` can succeed even if the path has been redirected to `/proc/sys/kernel/hostname`(which is also in procfs). **Path substitution** While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems. https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm ### Credits ### Thanks to Li Fubang (@lifubang from acmcoder.com, CIIC) and Tõnis Tiigi (@tonistiigi from Docker) for both independently discovering runc's original vulnerability, as well as Aleksa Sarai (@cyphar from SUSE) for the original research into this class of security issues and solutions.

Affected packages

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• GitHub advisory
• https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a
• https://github.com/youki-dev/youki/security/advisories/GHSA-vf95-55w6-qmrf
• https://pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/procfs
• https://youtu.be/tGseJW_uBB8
• https://youtu.be/y1PaBzxwRWQ
• https://github.com/advisories/GHSA-vf95-55w6-qmrf
• https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm
• https://nvd.nist.gov/vuln/detail/CVE-2025-62596