This is a Privilege Escalation vulnerability in how all modern versions of Windows and appears to relate to a function in splwow64.exe. Very little has been released on the technical details of the vulnerability, but the affects are fairly large. All versions of Windows after Server 2008 R2 are affected, including ARM versions. I'm very curous as to what the details are, as I think of only x64 versions when I look at splwow64.exe.

A local elevation of privilege vulnerability exists in how splwow64.exe handles certain calls, aka 'Microsoft splwow64 Elevation of Privilege Vulnerability'.