Microsoft Rolls Out Hotpatch KB5052105: Key Security Updates for Windows 11 LTSC

On February 11, 2025, Microsoft rolled out the hotpatch public preview KB5052105 for Windows 11 Enterprise LTSC 2024, ushering in several key security and quality improvements. If you’ve been keeping a close eye on the Windows update channels, you know that hotpatch updates have become an essential part of ensuring that Windows systems remain secure and efficient—even for those operating in environments where uptime is critical.

What’s New in KB5052105?​

The KB5052105 update, which tracks with OS Build 26100.3107, is primarily aimed at delivering miscellaneous security enhancements to the internal OS components. As with previous hotpatches, Microsoft integrates the latest servicing stack update (SSU) alongside this update. This means that before or during the installation of KB5052105, your system receives the SSU (version 26100.3189 from KB5052085) to ensure that the update process itself is as secure and reliable as possible.

Key Improvements and Fixes​

• Security Enhancements: This update makes various behind-the-scenes security improvements to core OS functionalities. Although the changes may seem “under the hood,” they are crucial for maintaining the overall integrity of the system.
• Quality Improvements: As part of the hotpatch process, Microsoft ensures that only new fixes and enhancements are applied if you’ve already received prior updates. This gradual approach helps to minimize disruptions while still fortifying the system.

Understanding Hotpatching and Servicing Stack Updates​

What is Hotpatching?​

Hotpatching is a sophisticated process that allows critical system updates—especially security patches—to be applied without the need for a full system restart. This is particularly valuable in enterprise environments and for servers running continuous, mission-critical operations. The seamless application of patches helps maintain uptime while minimizing the window of exposure to potential security vulnerabilities.

The Role of Servicing Stack Updates (SSU)​

Before any major update is installed, the latest servicing stack update is required. The SSU is responsible for ensuring that the update installation process itself is robust, fixing underlying issues in the update mechanism. With KB5052105, the combined installation of the SSU (KB5052085) means that your system is both prepped and fortified before any new hotpatch changes are implemented.

Prerequisites for Installing KB5052105​

Before you hit that “install now” button, make sure your system meets the following prerequisites:

• Windows Version Requirement: Your device must be running Windows 11, version 24H2. This is the supported platform for this hotpatch package.
• Prior Update Installation: Ensure that update KB5050009, which was released on January 14, 2025, is already installed on your device. This forms the foundation for the KB5052105 update.
• Enabling Virtualization-Based Security (VBS): VBS must be enabled on your machine to ensure that the installation of hotpatch updates is done securely. Virtualization-based security uses hardware virtualization features to create and isolate a secure region of memory from the normal operating system.
• Registry Setting for ARM Devices: If you’re running Windows on ARM-based devices, you must set a registry key to stop the OS from loading Compiled Hybrid Portable Executable (CHPE) binaries. To do so, configure the following:
• Registry Key: HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
• DWORD: HotPatchRestrictions=1

Note: After modifying this registry key, you'll need to restart your computer. Once set, the configuration persists across reboots, ensuring your device is ready for secure hotpatch updates in the future.

How to Install KB5052105​

Installation is straightforward, particularly if you’re using Windows Update. Here are your options:

• Windows Update: If you’re using Windows Update, the latest hotpatch and its accompanying SSU will be downloaded and installed automatically. This channel ensures minimal user intervention while keeping your device secure.
• Other Release Channels: For those managing devices via enterprise channels, options such as the Windows Update Catalog or Server Update Services (WSUS) are also available for deploying KB5052105.

Broader Implications for Windows Users​

For system administrators and tech enthusiasts alike, the arrival of hotpatch KB5052105 is a reminder of Microsoft’s ongoing efforts to reduce downtime and bolster security. Particularly in an era when cyber threats are increasingly sophisticated, the ability to update systems without prolonged interruptions is a significant advantage.
Hotpatch updates, when combined with rigorous prerequisites like enabling VBS and ensuring prior updates are in place, underline Microsoft’s commitment to a layered security approach. This proactive escalation in security measures not only protects sensitive enterprise data but also instills more confidence in the daily use of Windows 11.

Final Thoughts​

Whether you’re an IT admin rolling out updates across a fleet of devices or a tech-savvy user who likes to be on the forefront of the latest Windows enhancements, the KB5052105 update is a vital piece in keeping your system secure without sacrificing productivity. As you follow along with the Windows release health dashboard (don't forget to follow @WindowsUpdate for more insights!), it’s clear that up-to-date systems are a mainstay of a robust cybersecurity strategy in today’s digital landscape.
If you have any questions or run into issues during installation, the community here at WindowsForum.com is always ready to offer tips, guidance, and support. Stay secure, keep updating, and as always—happy patching!

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Source: Microsoft Support https://support.microsoft.com/en-us/topic/february-11-2025-hotpatch-public-preview-kb5052105-os-build-26100-3107-5483cd8c-b749-4b5e-a8d0-4f53a8e18f35