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Microsoft patch deactivates Intel's buggy Spectre fix

Microsoft issued an out-of-band patch (opens in new tab) over the weekend to disable Intel's own buggy fixes for the Spectre flaw. The patch is intended to help resolve an issue causing unwanted reboots on some PCs while Intel works on a fix of its own (via The Verge).

Intel last week confirmed that it had found the root cause of an issue causing PCs to randomly reboot after applying its Spectre fix. The chipmaker says it is working on a fix, but has recommended that PC manufacturers and customers stop installing the firmware update. In the meantime, Microsoft has released an update for systems that have already installed Intel's fix. From Microsoft:

While Intel tests, updates and deploys new microcode, we are making available an out of band update today, KB4078130, that specifically disables only the mitigation against CVE-2017-5715 – "Branch target injection vulnerability." In our testing this update has been found to prevent the behavior described.

The patch is only available as a manual update from the Windows Update Catalog (opens in new tab), and it covers Windows 7, Windows 8.1, and Windows 10 machines. Once installed, the patch should prevent random reboots from occurring, but you'll no longer be protected against Spectre variant 2.

Intel has stated that the root cause of the reboot issue has been identified for Haswell and Broadwell systems, but it's unclear where others stand. Other affected platforms include Ivy Bridge, Sandy Bridge, Skylake, and Kaby Lake CPUs, Intel previously revealed.

Although Intel's patches have been a cause for concern, other companies were quick to respond to the Meltdown and SPectre disclosure with their own fixes as well. Microsoft quickly outed an emergency patch for Windows systems, with a dedicated firmware update for Surface devices not long after. AMD also revealed optional patches, despite claiming the exploits pose a "non-zero" risk to its hardware. NVIDIA also responded with software patches for its GPU drivers.

Dan Thorp-Lancaster is the Editor in Chief for Windows Central. He began working with Windows Central as a news writer in 2014 and is obsessed with tech of all sorts. You can follow Dan on Twitter @DthorpL and Instagram @heyitsdtl. Got a hot tip? Send it to daniel.thorp-lancaster@futurenet.com.

12 Comments
  • Windows 7?!!
    I thought MS issued a BIOS fix only for Surface Pro 3 and newer surfaces....
  • You have to go to a special page to download and run it. It's only a fraction of a megabyte, and when you click 'run' there's no dialogue on screen. However, when you scan for hardware changes you are asked to reboot. Surface pro 4 does not list it in recently installed patches, yet.
  • yes I download the patch on my new hp pc with (i3 7100) it got so slow
    my old laptop was faster. so this is great news
  • Look at the Microsoft security release there's reg keys you can flip to disable the protect and get you back to a normal state.
  • I have an AMD C/GPU and since the outbreak of this epidemic, my computer restarts once every day and just simply stops displaying anything and hangs with the same frequency. I guess this is what I can expect in the future.
  • I doubt gigabyte will issue a BIOS update for my X79-UP4 board with Ivy Bridge cpu
  • The article does not mention the registry key change option that MS has also offered!
  • They deactivated Edge browser on Mobile.
    Idiots
  • Intel showed their true colors here. Such clowns.
  • Intel.... what a mess.
  • I thought GPUs don't do speculative pre-calc, and therefore aren't at risk? So why did AMD issue a patch for GPUs?
  • Anyone else think of Rudy's snapchat days when they read Spectre?? :)