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CVE-2026-49421 is a FreeBSD kernel pathname resolution protection bypass affecting unlinkat(2) and funlinkat(2). The implementation validated the AT_RESOLVE_BENEATH flag but failed to propagate that flag to the underlying path lookup logic. As a result, although callers could request path resolution constrained beneath a starting directory, the restriction was silently not enforced during resolution. This allows path traversal above the intended directory tree during unlink operations, defeating the expected containment semantics of AT_RESOLVE_BENEATH for these system calls.
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A FreeBSD path resolution restriction bypass involving AT_RESOLVE_BENEATH handling in unlinkat/funlinkat.
A FreeBSD path resolution vulnerability in unlinkat/funlinkat involving AT_RESOLVE_BENEATH that may allow bypass of directory traversal restrictions.
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