The swin.sys kernel driver in McAfee Application Control (MAC) 6.1.0 before build 706, 6.1.1 before build 404, 6.1.2 before build 449, 6.1.3 before build 441, and 6.2.0 before build 505 on 32-bit Windows platforms allows local users to cause a denial of service (memory corruption and system crash) or gain privileges via a 768 syscall, which triggers a zero to be written to an arbitrary kernel memory location.