Buffer overflow in the kernel in FreeBSD 7.3 through 9.0-RC1 allows local users to cause a denial of service (panic) or possibly gain privileges via a bind system call with a long pathname for a UNIX socket.
http://www.securitytracker.com/id?1026106
http://www.securityfocus.com/bid/49862
http://www.debian.org/security/2011/dsa-2325
http://security.freebsd.org/patches/SA-11:05/unix2.patch
http://security.freebsd.org/advisories/FreeBSD-SA-11:05.unix.asc