CVE-2026-49421

The kernel function that implements unlinkat2 and funlinkat2 validated the ATRESOLVEBENEATH 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 ATRESOLVEBENEATH with unlinkat2 or...

CVE-2026-49421 unlinkat(2) ignores AT_RESOLVE_BENEATH flag

The kernel function that implements unlinkat2 and funlinkat2 validated the ATRESOLVEBENEATH 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 ATRESOLVEBENEATH with unlinkat2 or...

CVE-2026-49421

CVE-2026-49421 affects the FreeBSD kernel in all supported versions. The kernel function implementing unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it to the underlying path lookup, silently dropping it. As a result, path resolution is not actually confined...

FreeBSD -- unlinkat(2) ignores AT_RESOLVE_BENEATH flag

Problem Description: The kernel function that implements unlinkat2 and funlinkat2 validated the ATRESOLVEBENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted. Impact: A process that uses...