The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, and Vista Gold does not properly allocate memory for the destination key associated with a symbolic-link registry key, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Memory Allocation Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7113
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-021
http://www.us-cert.gov/cas/techalerts/TA10-103A.html