Windows Hyper-V in Microsoft Windows Server 2008 SP2 and R2 SP1 Windows 7 SP1 Windows 8.1 Windows Server 2012 Gold and R2 Windows RT 8.1 Windows 10 Gold 1511 1607 1703 and Windows Server 2016 allows an attacker to gain elevated privileges on a target guest operating system when Windows Hyper-V instruction emulation fails to properly enforce privilege levels aka \Hypervisor Code Integrity Elevation of Privilege Vulnerability\.