Windows kernel in Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and RT1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and 1709, Windows Server 2016, and Windows Server, version 1709 allows an attacker to run arbitrary code in kernel mode, install programs, view, change or delete data, and create new accounts with full user rights due to improperly handing objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability".
