Vulnerability in FreeBSD

[ Description ]Official description

TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed by zero padding. The code which searches for the inner record type had an off-by-one bug which could be triggered by an invalid frame, leading to an underflow followed by an unconditional NULL pointer dereference, causing a kernel panic. A remote TLS 1.3 peer can send a specially crafted record to trigger a kernel panic, resulting in a Denial of Service (DoS).

[ Fixes ]Fixes and patches

• Patch on security.freebsd.orgVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3664

  FreeBSD Project FreeBSD OS: Multiple vulnerabilities Translated from German

  CVE-2026-84783CVE-2026-101305CVE-2026-101306+7 more CVEs

[ References ]References

• security.freebsd.org/advisories/FreeBSD-SA-26:67.ktls.ascMitigationPatchVendor Advisory