Vulnerability in FreeBSD

[ Description ]Official description

The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest. The size was re-read from guest memory on each use, and Transfer Request Block (TRB) fields were loaded without protection against concurrent modification by the guest. This race condition could be triggered by a guest running malicious, privileged code. A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL22 Oct 2026NCSC-2026-0452

  Vulnerabilities fixed in FreeBSD bhyve hypervisor Translated from Dutch

  Probability/damage M/HCVE-2026-101307CVE-2026-101308CVE-2026-101309+2 more CVEs
• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3967

  FreeBSD Project FreeBSD OS: Multiple vulnerabilities Translated from German

  CVE-2026-101311CVE-2026-101307CVE-2026-101308+2 more CVEs

[ References ]References

• security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc