win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP3 allows local users to gain privileges via a crafted application that triggers a NULL pointer dereference, aka "Win32k Null Pointer De-reference Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12546
https://exchange.xforce.ibmcloud.com/vulnerabilities/66402
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-034
http://www.vupen.com/english/advisories/2011/0952
http://www.us-cert.gov/cas/techalerts/TA11-102A.html
http://www.securitytracker.com/id?1025345
http://www.securityfocus.com/bid/47234
http://support.avaya.com/css/P8/documents/100133352