ZoneAlarm Pro 6.5.737.000, 6.1.744.001, and possibly earlier versions and other products, allows local users to cause a denial of service (system crash) by sending malformed data to the vsdatant device driver, which causes an invalid memory access.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34028
http://www.vupen.com/english/advisories/2007/1608
http://www.securityfocus.com/bid/23734
http://www.securityfocus.com/archive/1/467269/100/0/threaded