Microsoft has released the optional KB5055612 preview cumulative update for Windows 10 22H2 with two changes, including a fix for a GPU paravirtualization bug in Windows Subsystem for Linux 2 (WSL2).
The KB5055612 cumulative update preview is part of Microsoft’s “optional non-security preview updates” schedule, typically released at the end of every month. This update allows Windows admins to test upcoming fixes and features that will be released in the upcoming May Patch Tuesday.
Unlike Patch Tuesday cumulative updates, this preview update does not include security updates.
Windows users can install this update by going into Settings, clicking on Windows Update, and manually performing a ‘Check for Updates.’
As this is an optional update, unless you have the “Get the latest updates as soon as they’re available” option enabled in Windows Update, you will be asked whether you wish to install it by clicking the ‘Download and install’ link.
Source: BleepingComputer
After installing this update, Windows 10 22H2 will be updated to build 19045.5796.
Windows 10 users can also manually download and install the KB5055612 preview update from the Microsoft Update Catalog.
What’s new in Windows 10 KB5055612
Microsoft has not added new features in this update, and it only includes bug fixes and security improvements.
The highlighted changes in the KB5055612 update are:
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[Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality.
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[Graphics] Fix: The check for GPU paravirtualization was case-sensitive in the Windows Subsystem for Linux 2 (WSL2). This issue might potentially cause GPU paravirtualization support to fail.
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[OS Security] Updates to the Windows Kernel Vulnerable Driver Blocklist (DriverSiPolicy.p7b). Additions have been made to blocklist drivers with security vulnerabilities that have been used in Bring Your Own Vulnerable Driver (BYOVD) attacks.
Microsoft says there are two known issues, all of which have been problematic since the January 2025 updates.
Windows updates may fail if the Citrix Session Recording Agent (SRA) version 2411 is installed on the device.
“As a workaround, stop the Session Recording Monitoring service, install the Microsoft security update, and enable the Session Recording Monitoring service,” explains a Citrix support bulletin.
The second issue is that Windows EventViewer may incorrectly display an Event 7023 error about SgrmBroker.exe, stating, “The System Guard Runtime Monitor Broker service terminated with the following error: %%3489660935.”
Microsoft says that SgrmBroker.exe currently serves no purpose in the operating system, and the errors can be ignored. The bug will be fixed in future Windows updates.
A complete list of fixes can be found in the KB5055612 support bulletin.
