The Windows kernel in Windows 7 SP1 and Windows Server 2008 R2 SP1 allows an elevation of privilege vulnerability due to the way it handles objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability."
https://www.exploit-db.com/exploits/44581/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-1038
https://blog.xpnsec.com/total-meltdown-cve-2018-1038/