An update for the latest version of Windows 10 now mitigates Spectre variant 2 on systems running the April 2018 Update with Coffee Lake, Kaby Lake, Skylake, Haswell, and more processors.
Windows 10 1803 RSS
Microsoft's Windows 10 version 1803 might actually have a sensible name - the Windows 10 April 2018 Update. The firm appears to be dropping themed names going forward and moving to a simpler scheme.
