The sys_set_mempolicy function in mempolicy.c in Linux kernel 2.6.x allows local users to cause a denial of service (kernel BUG()) via a negative first argument.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10576
http://www.ubuntu.com/usn/usn-199-1
http://www.securityfocus.com/bid/15049
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2005-808.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:220
http://www.mandriva.com/security/advisories?name=MDKSA-2005:219
http://www.debian.org/security/2006/dsa-1017
http://secunia.com/advisories/19374
http://secunia.com/advisories/17826
http://secunia.com/advisories/17364
http://secunia.com/advisories/17141
http://linux.bkbits.net:8080/linux-2.6/cset%4042eef8b09C5r6iI0LuMe5Uy3k05c5g