Windows 11 KB5013943 is crashing PCs with BSOD, antivirus firm Sophos warns

Windows 11 BSOD

The problems introduced by Windows 11 KB5013943 (May 2022 Patch
Tuesday) are pretty serious: it’s crashing computers with Blue
Screen of Death if they rely on certain drivers required for
apps like antivirus.

For those unaware, KB5013943 (May 2022) was released on
May 10 and it’s an automatic security update, meaning some
users don’t have a choice whether to download and install it
and they run into critical errors like BSODs or app crashes.
The problem is also present in the update for those using
Windows 10, but it’s worse on Windows 11.

This cumulative update was released to fix a number of issues
and bugs in Windows 11, however, it seems like Windows 11
KB5013943 is causing the dreaded Blue Screen of Death (BSOD) on
some systems with specific drivers, including those that
support antivirus software.

Sophos has confirmed that Windows 11 KB5013943 patch for the
operating system is causing Blue Screen of Death i.e stop error
codes that make the desktop unresponsive, due to compatibility
issues between drivers and May 2022 Patch Tuesday.

A user who encountered the Blue Screen of Death errors
described their problem in the Microsoft Answers forum and
Reddit, with one user stating “ever since updating to this
build, getting BSOD 10-15 minutes into playing Hitman 3. The
blue screen shows for literally 1 second, so I can’t even see
what error it is showing”.

Another user added that they experienced Blue Screen errors
with vague error codes like “APC_INDEX_MISMATCH” on their
primary and secondary machines, including the virtual machines.

Affected users have claimed that the BSOD is triggered
immediately after their devices are updated to the latest

While Microsoft has yet to acknowledge the reports of the Blue
Screen of Death error hitting Windows 11 machines, Sophos
confirmed that the update could make your device unbootable.

“Customers on Windows 11 running Sophos Home may encounter a
BSOD/Stop error after installing Windows Update KB5013943 and
restarting their machines,” Sophos noted in their
support documents.

“The symptoms involve being unable to get to the desktop after
restarting the computer/shutting down powering it back on
post-installation of Windows Update KB5013943. This includes a
Stop Error Index Mismatch message (Blue Screen),” the security
firm noted.

To fix the BSOD errors, Sophos recommends uninstalling the
update by following these steps:

  • Pause Windows updates to prevent the update from
  • Select Start > Settings > Windows Update.
  • Pause updates for 7 days.
  • Open Control Panel.
  • Click Programs And Features.
  • Click View installed updates
  • Look for KB5013943 and uninstall it.

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