NICM.SYS driver 3.0.0.4, as used in Novell NetWare Client 4.91 SP4, allows local users to execute arbitrary code by opening the \\.\nicm device and providing crafted kernel addresses via IOCTLs with the METHOD_NEITHER buffering mode.
https://exchange.xforce.ibmcloud.com/vulnerabilities/39576
http://www.vupen.com/english/advisories/2008/0088
http://www.securitytracker.com/id?1019172
http://www.securityfocus.com/bid/27209
http://secunia.com/advisories/28396
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=637