The Windows kernel-mode drivers in win32k.sys in Microsoft Windows XP SP2 and SP3 Windows Server 2003 SP2 Windows Vista SP1 and SP2 Windows Server 2008 Gold SP2 and R2 and Windows 7 do not properly validate an unspecified system-call argument which allows local users to cause a denial of service (system hang) via a crafted application aka \Win32k Bounds Checking Vulnerability.\