The "capabilities" feature in Linux before 2.2.16 allows local users to cause a denial of service or gain privileges by setting the capabilities to prevent a setuid program from dropping privileges, aka the "Linux kernel setuid/setcap vulnerability."
http://www.securityfocus.com/bid/1322
http://www.redhat.com/support/errata/RHSA-2000-037.html
http://archives.neohapsis.com/archives/bugtraq/2000-06/0063.html
http://archives.neohapsis.com/archives/bugtraq/2000-06/0062.html