CVE-2008-3890
The kernel in FreeBSD 6.3 through 7.0 on amd64 platforms can make an extra swapgs call after a General Protection Fault (GPF), which allows local users to gain privileges by triggering a GPF during the kernel’s return from (1) an interrupt, (2) a trap, or (3) a system call.
Date published : 2008-09-05
http://www.securityfocus.com/bid/31003
http://security.freebsd.org/advisories/FreeBSD-SA-08:07.amd64.asc