Introduction

On April 22, 2025, Microsoft released the KB5055612 update for Windows 10 version 22H2, marking a significant step in enhancing the operating system's stability, security, and performance. As Windows 10 approaches its end-of-support date on October 14, 2025, this update underscores Microsoft's commitment to providing robust support for long-term users.

Key Improvements in KB5055612

GPU Paravirtualization Fix in WSL2

A notable enhancement in this update is the resolution of a case-sensitivity issue in GPU paravirtualization checks within the Windows Subsystem for Linux 2 (WSL2). Previously, this bug could cause GPU paravirtualization support to fail, impacting developers and users relying on GPU-accelerated workloads in WSL2 environments. The fix ensures improved reliability and performance for tasks involving CUDA, OpenCL, or DirectML within WSL2. (support.microsoft.com)

Expansion of the Windows Kernel Vulnerable Driver Blocklist

To bolster system security, KB5055612 updates the Windows Kernel Vulnerable Driver Blocklist (DriverSiPolicy.p7b). This expansion includes additional drivers known to have security vulnerabilities exploited in Bring Your Own Vulnerable Driver (BYOVD) attacks. By preventing these drivers from loading, the update mitigates potential elevation of privilege attacks, enhancing overall system security. (support.microsoft.com)

Resolution of System Guard Runtime Monitor Broker Service Error

The update addresses a known issue where the Windows Event Viewer displayed an error related to the System Guard Runtime Monitor Broker service (SgrmBroker.exe). This error, identified as Event 7023, indicated that the service terminated unexpectedly. While the error was largely cosmetic and did not affect system performance, its resolution contributes to a cleaner and more reliable system log. (support.microsoft.com)

Implications and Impact

The KB5055612 update is particularly significant for enterprise environments and developers utilizing WSL2 for development purposes. By addressing GPU paravirtualization issues, the update ensures that developers can run GPU-accelerated workloads more reliably within WSL2, facilitating tasks such as machine learning and data analysis.

The enhancement of the Windows Kernel Vulnerable Driver Blocklist reflects Microsoft's proactive approach to security, aiming to protect systems from known vulnerabilities and potential exploits. This is especially crucial as Windows 10 nears its end-of-support date, ensuring that users have a secure computing environment during the transition period.

Technical Details

The KB5055612 update advances Windows 10 version 22H2 to OS Build 19045.5796. It is classified as a non-security preview update, focusing on quality improvements and bug fixes. Users can install this update by navigating to Settings > Update & Security > Windows Update and selecting the optional updates available. Alternatively, the standalone package is available through the Microsoft Update Catalog. (support.microsoft.com)

It's important to note that this update includes the latest servicing stack update (SSU), which enhances the reliability of the update process and mitigates potential issues during installation. (support.microsoft.com)

Conclusion

The release of KB5055612 demonstrates Microsoft's ongoing dedication to maintaining and improving Windows 10 as it approaches its end-of-support date. By addressing critical issues in WSL2, enhancing security measures, and resolving known errors, this update provides long-term users with a more stable and secure operating system experience.