CVE-2026-49421

Summary

The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted.

A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree.

Affected Software

Weaknesses

• CWE-273: CWE-273: Improper Check for Dropped Privileges

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:42.unlinkat.asc

• ←Previous
• Next→