Integer overflow in aswFW.sys 5.0.594.0 in Avast! Internet Security 5.0 Korean Trial allows local users to cause a denial of service (memory corruption and panic) via a crafted IOCTL_ASWFW_COMM_PIDINFO_RESULTS DeviceIoControl request to \\.\aswFW.
http://x90c.blogspot.com/2011/12/bid-42148-my-avast-kernel-driver-0day_01.html
http://x90c.blogspot.com/2011/11/avast-internet-security-aswfwsys-ioctl.html