Race condition in the kernel in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 allows local users to bypass the Low Integrity protection mechanism and write to files by leveraging unspecified object-manager features, aka "Windows File System Security Feature Bypass."
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-092