RegMon 7.04 does not properly validate certain parameters to System Service Descriptor Table (SSDT) function handlers, which allows local users to cause a denial of service (crash) and possibly gain privileges via kernel SSDT hooks to the (1) NtCreateKey and (2) NtOpenKey Windows Native API functions.
http://www.securityfocus.com/bid/25721
http://www.securityfocus.com/archive/1/479830/100/0/threaded
http://www.matousec.com/info/advisories/plague-in-security-software-drivers.php