CVE-2026-49421 — unlinkat(2) ignores AT_RESOLVE_BENEATH flag
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…
Published: 2026-08-19 · CVSS: 7.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7