Integer overflow in Realtek HD Audio Codec Drivers RTKVHDA.sys and RTKVHDA64.sys before 6.0.1.5605 on Windows Vista allows local users to execute arbitrary code via a crafted IOCTL request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42079
http://www.vupen.com/english/advisories/2008/1350/references
http://www.securityfocus.com/bid/28909
http://www.securityfocus.com/archive/1/491249/100/0/threaded