CVE WatchAug 19, 2026

CVE-2026-49421

The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the

CVSS

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No CVSS

EPSS

0.1%

KEV

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Exploit Today

0-100

Published: Aug 19, 2026 · Last modified: Aug 19, 2026 · CWE-273

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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

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