KB5055612: Cumulative update for Windows 10, version 22H2, April 2025. WSL2 GPU support and System Guard service errors fixed

Fixes a WSL2 GPU paravirtualization check and a System Guard Runtime Monitor Broker error in Event Viewer. It also updates the vulnerable driver blocklist.

Does it affect you? Applies to: Devices running Windows 10, version 22H2.

Microsoft publishes separate notes for this KB for Windows 11.

What changes

Improvements 3 changes

Internal Windows OS

Internal Windows OS functionality gets miscellaneous security improvements.¹

OS Security

Verified in package

The vulnerable driver blocklist adds drivers with security vulnerabilities that have been used in attacks.²
Updates the Windows Kernel Vulnerable Driver Blocklist (DriverSiPolicy.p7b) to block vulnerable drivers used in Bring Your Own Vulnerable Driver (BYOVD) attacks.

Servicing stack

The component that installs Windows updates gets quality improvements.³
The cumulative update is combined with servicing stack update KB5055663, build 19045.5789.

Fixes 2 changes

Graphics

For: WSL2 users

The GPU paravirtualization check in WSL2 is no longer case-sensitive, which could cause GPU paravirtualization support to fail.⁴
Fixes the case-sensitive GPU paravirtualization check in Windows Subsystem for Linux 2 (WSL2).

System Guard Runtime Monitor Broker service

Event Viewer no longer displays the reported System Guard Runtime Monitor Broker service error on devices with Windows updates released January 14, 2025, or later.⁵
Fixes Event 7023 in Windows Logs > System, with text similar to “The System Guard Runtime Monitor Broker service terminated with the following error: %%3489660935”.

Known issues

Open Affects: Organizations and IT administrators

Citrix

Devices with Citrix Session Recording Agent version 2411 might fail to complete installation of the January 2025 Windows security update and revert to the updates already installed. Home users are not expected to be affected.⁶

How to apply the workaround Workaround

Upgrade Citrix Session Recording Agent to version 2503 or newer; this resolves the issue.⁶
Open Affects: Everyone

Noto fonts issue

CJK text might look blurry or unclear at 96 DPI (100% scaling) in Chromium-based browsers such as Microsoft Edge and Google Chrome.⁷

How to apply the workaround Workaround

Increase display scaling to improve clarity. Users can also report Noto CJK font issues through the Google Noto Fonts GitHub repository.⁷

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released: 2025-04-22
Classification: Updates
Type: Cumulative update
Restart: Required
Replaces: KB5053643, KB5052077, KB5050081, KB5046714

+10 earlier
KB5045594, KB5043131, KB5041582, KB5040525, KB5039299, KB5037849, KB5036979, KB5035941, KB5034843, KB5034203
Replaced by: KB5061768

Version	Build	Channel
22H2	19045.5796	General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 22H2

712.0 MB

windows10.0-kb5055612-x64.msu Main update · KB5055612 SHA-1: 126e24dc…3b3a8b

Arm64 22H2

664.0 MB

windows10.0-kb5055612-arm64.msu Main update · KB5055612 SHA-1: 247e34ff…9396c7

x86 22H2

414.9 MB

windows10.0-kb5055612-x86.msu Main update · KB5055612 SHA-1: 5a8c2093…2095f3

Updated components

5,098 files changed since the previous update for the same versions.

Top changed components	Files
Settings	127
Graphics and display	75
Remote Desktop	55
Security and sign-in	48
Bluetooth	45
Networking	45
Printing	43
File Explorer and shell	42
Search	34
Hyper-V and virtualization	32
Audio	23
Secure Boot	21

Verified in package: changed files confirm OS Security.

Sources

Microsoft Support: KB5055612

Updated Oct 27, 2026

Cited passages from Microsoft's official notes (7)

1. This update contains miscellaneous security improvements to internal Windows OS functionality. support.microsoft.com
2. Additions have been made to blocklist drivers with security vulnerabilities that have been used in Bring Your Own Vulnerable Driver (BYOVD) attacks. support.microsoft.com
3. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
4. Fix: The check for GPU paravirtualization was case-sensitive in Windows Subsystem for Linux 2 (WSL2). support.microsoft.com
5. Fixed: The Windows Event Viewer might display an error related to SgrmBroker.exe, on devices that have installed Windows updates released January 14, 2025, or later. support.microsoft.com
6. Devices that have certain Citrix components installed might be unable to complete installation of the January 2025 Windows security update. support.microsoft.com
7. There are reports of blurry or unclear CJK (Chinese, Japanese, Korean) text when displayed at 96 DPI (100% scaling) in Chromium-based browsers such as Microsoft Edge and Google Chrome. support.microsoft.com

Checked automatically: 8 of 8 checks passed, 7 quoted passages · compared with Microsoft's page on Oct 20, 2026

Quotes found in the official pages: passed
Numbers found in the sources: passed
Vulnerabilities from the dossier only: passed
Links to allowed domains only: passed
Every official change covered: passed
Readable plain text: passed
Changes confirmed by the file list: passed
Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake