Does this also affect the latest Coffee Lake processors?
That I do not know..............
This may answer your question:
from FReeper swordmaker’s post #64:
Mitigations by Linux code-base maintainers are underway, as are changes by Microsoft to protect Windows users. In response to a query, Microsoft told AppleInsider that they had no comment on a timetable of a release to fix the security flaw at this time, but kernel memory handling was altered by the company in Windows 10 beta builds in the end of 2017.