An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows Server 2016, Windows 10, Windows Server 2019, Windows 10 Servers.
https://www.exploit-db.com/exploits/46104/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8584