>>In it he warns that errata contained in the Intel processor is susceptible to security exploits that put users and enterprises at serious risk of being compromised. The exposure can exist even in cases where Intel has issued a fix, de Raadt said, because patches in the microcode frequently don’t get installed on systems purchased from smaller vendors or that run less popular operating systems.<<
Translation, Windows is safe. Any other operating system is at risk.
Uh. No.
Correct translation, Windows may possibly be safe but no one knows for sure because Intel isn't talking about the actual problem and hasn't actually issued microcode patches for all of the errata that they published.
Other OSes are vulnerable as long as Intel doesn't fess up because you can't fix what you don't know. When the facts come out and the other OSes issue patches, they will be verifiably safe.