Windows 10 version 1803 microcode update KB4100347 - gHacks Tech News

Windows 10 version 1803 microcode update KB4100347

KB4100347 is a new update for the latest version of Windows 10, Windows 10 version 1803, which Microsoft released on April 30, 2018 to the public.

The feature update has its fair share of issues; users complain about incompatibilities with certain Solid State Drives, bluescreens, missing network devices, and other issues.

One of the things that I noticed right away after installing the April 2018 Update for Windows 10 on a test system was that it did not include the microcode update that protects it from Spectre attacks.

What made this particularly problematic was that Microsoft released microcode updates for previous versions of Windows 10. Systems went from a protected state to an unprotected one in worst case if users or administrators installed the microcode update on devices running previous versions of Windows 10 before running the upgrade to the latest version.

Tip: you can run the free software inSpectre to find out if a Windows PC is patched and whether microcode updates are available.

KB4100347

kb4100347 microcode update windows 10 1803

It took Microsoft two weeks to release the microcode update for Windows 10 version 1803 that protects devices against Spectre attacks. The company released KB4100347 on May 15, 2018. The update is available through Windows Update and the Microsoft Update Catalog website and compatible with Windows 10 version 1803 and Windows Server 2016 Version 1803 (Server Core)

Windows devices configured to download available updates automatically through Windows Update will get the microcode update automatically provided that a supported processor is installed on the machine.

You can check the list of supported processors on Microsoft's Support website. It includes Kaby Lake, Coffee Lake, Broadwell, SkyLake, Haswell, Ivy Bride, and Sandy Bridge processors. Microsoft plans to update the Windows update to support additional processors.

You may download the update from the Microsoft Update Catalog website as well. It has a size of just 1 Megabyte and can be installed on machines running Windows 10 version 1803 or Windows 10 Server 2016.

Note that the installation will only succeed if a supported processor is installed on the machine the update is executed on.

Closing Words

The microcode updates for Windwos 10 version 1803 are finally available. The release removes one reason for staying on an earlier version of Windows 10. It is still too early to upgrade to Windows 10 version 1803 but users and admins who upgraded PCs to the new version may want to install it asap to protect the device against Spectre-based attacks. (via Deskmodder)

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Summary
Windows 10 version 1803 microcode update KB4100347
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Windows 10 version 1803 microcode update KB4100347
Description
KB4100347 is a new update for the latest version of Windows 10, Windows 10 version 1803, which Microsoft released on April 30, 2018 to the public.
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Ghacks Technology News
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Comments

  1. Thorky said on May 16, 2018 at 10:03 am
    Reply

    I have an Intel Xeon E3-1245 v3, but I can’t find it in the list. Does anybody know, if it is supported so I can install the patch?

    1. Al CiD said on May 16, 2018 at 11:29 am
      Reply

      Search for your CPUID in the list…

      My E3-1225 v3 has CPUID: 306C3 and is listed in line “Haswell (including H, S), Xeon E3”

      1. Thorky said on May 17, 2018 at 9:40 am
        Reply

        Thank you! Worked! :)

    2. Al CiD said on May 16, 2018 at 1:11 pm
      Reply

      You can search by CPUID
      My E3-1225 v3 is “306C3” and is listed.

      Perhaps my post is dubled, but I don´t see my previous reply-post anymore…

  2. Mary said on May 16, 2018 at 10:32 am
    Reply

    Hi,

    Windows update doesn’t find it so I have installed from the catalog. Is normal? I have a Braswell and last month with 1709 installed the KB4090007. But with 1803 I have checked 4-5 times but WU doesn t find the KB4100347

  3. chesscanoe said on May 16, 2018 at 12:07 pm
    Reply

    I successfully installed KB4100347 6 hours ago from Microsoft Update catalog, as Windows Update did not have it available then. If you then run Belarc Advisor (free for home use), KB4100347 is then shown as an installed hotfix.

  4. mary said on May 16, 2018 at 12:21 pm
    Reply

    I have an Haswell in the list and with win 10 1709 I downloaded KB4090007 and was spectre protected. Now I have win 10 1803 and Windows Update doesn’t find this new microcode update (checked manually 4-5 times) so I downloaded from Catalog update. Is normal? Will be distribuited gradually?

  5. Anonymous said on May 16, 2018 at 12:50 pm
    Reply

    “It is still too early to upgrade to Windows 10 version 1803” – point is, MS thinks not and pushes users to this version

    This is not available through windows update, at least for me.

  6. Anonymous said on May 16, 2018 at 3:24 pm
    Reply

    I have Ivy Bridge

    3rd Generation Intel® Core™ Mobile Processor Family, which is listed in the CPUIDs

    it is unpached

    but for some reason download is not avaible thorugh windows update

  7. ddk said on May 16, 2018 at 4:09 pm
    Reply

    I have yet to read or hear about anyone who’s been afflicted by these attacks.
    Disabled both protections, the performance hit is too severe & don’t buy the argument this can bypass anti-exploit or sandboxed environments….sorry.

  8. Ann said on May 16, 2018 at 4:47 pm
    Reply

    I had less issues with installing 1803, 1709 kept failing to install and made my system crash every couple of weeks. this week it has forgotten to crash or the update resolved that issue.

    That i would not be protected against Spectre i find worth the risk.

  9. Pete12 said on May 16, 2018 at 5:10 pm
    Reply

    Just installed on my brand new 1803 , system is protected and performance is good !
    Takes 2 seconds more for booting , went from 8 to 10 seconds ; a small price for more safety ………

  10. Dave said on May 16, 2018 at 6:12 pm
    Reply

    I still haven’t seen 1803 on either PC.

    I have one running win 10 home and I don’t tweak anything.

    Perhaps it’s because I don’t go looking for updates?

  11. Anonymous said on May 16, 2018 at 7:14 pm
    Reply

    You have to download manually , its not ( yet) provided by WUS………..

  12. Pete12 said on May 16, 2018 at 7:16 pm
    Reply

    You have to download it manually , its not yet provided by WUS…….

  13. Gabriel said on May 16, 2018 at 7:54 pm
    Reply

    Like everyone else, I had to manually download it from the catalog.
    InSpectre says I’m now patched against Spectre.
    Several issues though that I did not have with the patch on 1703:
    Boot time takes about 3 seconds more than before (so about 12 seconds for a fully responsive system)
    Some USB devices are “disconnected” until fully booted. Mainly my mouse. It doesn’t even show the cursor for at least 3-4 seconds after the desktop is show.

  14. hash said on May 16, 2018 at 8:04 pm
    Reply

    The Microsoft Update Catalog downloads appear to be http only (not https)?

    Is there some page that declare file SHA256 hashes to verify the downloaded files against?

  15. Pete12 said on May 17, 2018 at 3:55 pm
    Reply

    No severe problems , so far .
    Only noticed ; very difficult to shut down external HDDs , ” still in use ” ( by what….???)
    So have to reboot for closing external HDDs ………..

  16. Dave said on May 17, 2018 at 5:53 pm
    Reply

    Jinxed again! I post here that I’ve not seen the new “feature update” and it pops up on my PC running win10 home.

    I already rolled it back as it broke my network and none of the fixes I read about here worked.

  17. Dave said on May 17, 2018 at 5:53 pm
    Reply

    Jinxed again! I post here that I’ve not seen the new “feature update” and it pops up on my PC running win10 home. (Same thing happened with 1709)

    I already rolled it back as it broke my network and none of the fixes I read about here worked.

  18. EP said on May 25, 2018 at 12:55 am
    Reply

    Go to the MS Update Catalog site again for KB4100347:
    https://www.catalog.update.microsoft.com/Search.aspx?q=4100347

    It recently has a “Last Updated” date of 5/17/2018 instead of 5/15/2018.
    Also on MS Update Catalog, the KB4090007, KB4091663, KB4091664 & KB4091666 updates have been recently revised once again to include updated Intel microcodes for Ivy Bridge and Sandy Bridge CPUs like the ones found in the KB4100347 update

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