CVE-1999-1476
A bug in Intel Pentium processor (MMX and Overdrive) allows local users to cause a denial of service (hang) in Intel-based operating systems such as Windows NT and Windows 95, via an invalid instruction, aka the "Invalid Operand with Locked CMPXCHG8B Instruction" problem.
Date published : 2002-03-09
http://support.microsoft.com/support/kb/articles/q163/8/52.asp