win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP3 does not properly validate the arguments to functions, which allows local users to read arbitrary data from kernel memory via a crafted application that triggers a NULL pointer dereference, aka "Win32k Incorrect Parameter Validation Allows Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12778
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/48607
http://support.avaya.com/css/P8/documents/100144947