NWFILTER.SYS in Novell Client 4.91 SP 1 through SP 4 for Windows 2000, XP, and Server 2003 makes the \.\nwfilter device available for arbitrary user-mode input via METHOD_NEITHER IOCTLs, which allows local users to gain privileges by passing a kernel address as an argument and overwriting kernel memory locations.
https://secure-support.novell.com/KanisaPlatform/Publishing/98/3260263_f.SAL_Public.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/38434
http://www.vupen.com/english/advisories/2007/3846
http://www.securitytracker.com/id?1018943
http://www.securityfocus.com/bid/26420
http://secunia.com/advisories/27678
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=626