An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'.
https://www.tenable.com/blog/microsoft-s-july-2019-patch-tuesday-what-you-need-to-know
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1132