FreeBSD 11.2-STABLE, 12.0-STABLE < r343781, 12.0-RELEASE < p3 - Privilege Escalation via UNIX Domain Socket
In FreeBSD 11.2-STABLE after r338618 and before r343786, 12.0-STABLE before r343781, and 12.0-RELEASE before 12.0-RELEASE-p3, a bug in the reference count implementation for UNIX domain sockets can cause a file structure to be incorrectly released potentially allowing a malicious local user to gain root privileges or escape from a jail.