Use-after-free vulnerability in win32k.sys in the kernel-mode drivers in Microsoft Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows local users to gain privileges via a crafted application that leverages incorrect driver object management, aka "Win32k Use After Free Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12847
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-054
http://www.us-cert.gov/cas/techalerts/TA11-193A.html
http://www.securitytracker.com/id?1025761
http://www.securityfocus.com/bid/48591
http://support.avaya.com/css/P8/documents/100144947