Linux Intrusion Detection System (LIDS) 0.9.7 allows local users to gain root privileges when LIDS is disabled via the security=0 boot option.
http://www.securityfocus.com/bid/1549
http://www.lids.org/changelog.html
http://www.egroups.com/message/lids/1038
http://archives.neohapsis.com/archives/bugtraq/2000-07/0486.html