Windows 10: Microcode Updates May 15, 2019

Microsoft has released microcode updates for Windows 10 V1607 through 1803 and Windows Server 2019. These are revised versions of Intel Microcode updates that have been rolled out in previous months.


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An overview of the Intel Microcode updates (for Windows Server 2016 and Windows 10 Version 1607) can be found here, details can be found in the following KB articles.

KB Number and Description Windows Version Source
KB4100347 Intel Microcode Updates Windows 10, version 1803, and Windows Server, version 1803 Windows Update, Windows Server Update Service, and Microsoft Update Catalog
KB4090007 Intel Microcode Updates Windows 10, version 1709, and Windows Server 2016, version 1709 Windows Update, Windows Server Update Service, and Microsoft Update Catalog
KB4091663 Intel Microcode Updates Windows 10, version 1703 Windows Update, Windows Server Update Service, and Microsoft Update Catalog
KB4091664 Intel Microcode Updates Windows 10, version 1607, and Windows Server 2016 Windows Update, Windows Server Update Service, and Microsoft Update Catalog
KB4091666 Intel Microcode Updates Windows 10 (RTM) V1507 Windows Update, Windows Server Update Service, and Microsoft Update Catalog

The Intel microcode updates delivered and validated by Microsoft address the following side channel attacks.

  • Spectre Variant 3a (CVE-2018-3640: “Rogue System Register Read (RSRE)”)
  • Spectre Variant 4 (CVE-2018-3639: “Speculative Store Bypass (SSB)”)
  • L1TF (CVE-2018-3620, CVE-2018-3646: “L1 Terminal Fault”)

Intel Microcode updates are available for download from the Microsoft Update Catalog. Further details can be found in Microsoft Support article 4093836. The colleagues from deskmodder.de have compiled download addresses in this article.


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