CVE-2024-43102: Freebsd

Critical severity, CVSS 10.0. EPSS: 0.7% chance of exploitation in the next 30 days.

Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of UMTX_OP_SHM can lead to decreasing the reference count of the object representing the mapping too many times, causing it to be freed too early. A malicious code exercizing the UMTX_SHM_DESTROY sub-request in parallel can panic the kernel or enable further Use-After-Free attacks, potentially including code execution or Capsicum sandbox escape.

Affected products

• Freebsd Freebsd: from 13.0, before 13.3 (fixed in 13.3); version 13.3 only; version 13.4 only; version 14.0 only; version 14.1 only

Published 2024-09-05. Last modified 2026-06-17.