Buffer overflow in the Linux binary compatibility module in FreeBSD 3.x through 5.x allows local users to gain root privileges via long filenames in the linux shadow file system.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5968
http://www.securityfocus.com/bid/1628
http://archives.neohapsis.com/archives/freebsd/2000-08/0338.html