The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate user-mode pointers in unspecified error conditions, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Pointer Validation Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6231
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025
http://www.vupen.com/english/advisories/2009/1544
http://www.us-cert.gov/cas/techalerts/TA09-160A.html
http://www.securitytracker.com/id?1022359
http://www.securityfocus.com/bid/35238