https://www.techradar.com/news/windows-10-gets-intels-patches-for-worrying-new-foreshadow-flaw

On the security front, Microsoft has pushed out a new batch of microcode updates for Windows 10 which mitigate against the Foreshadow vulnerability, along with additional Spectre variants.

As ZDNet spotted, the microcode patches, piped over from Intel, address the following flaws in the company’s processors: Spectre variant 3a (‘rogue system register read’) and variant 4 (‘speculative store bypass’), along with Foreshadow, a fresh vulnerability that came to light earlier this month, which hit the firm’s high-end Core and Xeon processors.