CVE-2026-45257

CVE-2026-45257 : FreeBSD KTLS receive path decrypts in place, enabling an unprivileged local user to overwrite a file’s page cache via sendfile(2) data over a loopback connection when KTLS receive is enabled. This can corrupt the backing file and allow privilege escalation by overwriting setuid/t...

FreeBSD-SA-26:26.ktls

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:26.ktls Security Advisory The FreeBSD Project Topic: Arbitrary file overwrite via the KTLS receive path Category: core Module: ktls Announced: 2026-06-09...

FreeBSD Security Advisory - FreeBSD-SA-26:26.ktls

FreeBSD Security Advisory - The KTLS receive path decrypted each record in place, assuming that the mbufs holding received data were anonymous and safe to modify. This assumption does not hold for data placed on a socket by sendfile2, which can reference file-backed memory directly through...