The kernel-mode drivers in Microsoft Windows Vista SP2, 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, and 1607, and Windows Server 2016 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability."
https://www.mandiant.com/resources/blog/cyber-espionage-apt32
https://security.googleblog.com/2016/10/disclosing-vulnerabilities-to-protect.html
https://github.com/mwrlabs/CVE-2016-7255
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-135