February 10, 2026—KB5075941 (OS Build 22631.6649)

​​​​​Announcements and messages

This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.

Improvements

This update addresses security issues for your Windows operating system. ​​​​​​​

This security update contains fixes and quality improvements from KB5073455 (released January 13, 2026), KB5077797 (released January17, 2026), and KB5078132 (released January,24, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Secure Boot] 

  • ​​​​​​​​​​​​​​This release will execute updates in the Boot Manager on devices that already have the Windows UEFI CA 2023 certificate in their Secure Boot Signature Database (DB). It replaces the 2011 signed bootmgfw.efi with the 2023 signed bootmgfw.efi. Be advised of the consequences of resetting the DB or turning Secure Boot on or off, as this can cause a "Secure Boot violation" issue. In those rare cases, the solution is to create the Secure Boot recovery media. 

    • With this update, Windows quality updates include a broad set of targeting data that identifies devices and their ability to receive new Secure Boot certificates. Devices will receive the new certificates only after they show sufficient successful update signals, which helps ensures a safe and phased rollout.

• [Display & Graphics] Fixed: This update addresses an issue caused the Desktop Window Manager (DWM) process to re‑start unexpectedly. ​​​​​​​

• [File Explorer] Fixed: This update addresses an issue where folder renaming with desktop.ini files in File Explorer isn't work correctly. The LocalizedResourceName setting is ignored, so custom folder names don't appear.

• [Fonts & Display] Updates the Chinese fonts to support the GB18030‑2022A standard for character coverage and display.

• [Graphics] Fixed: This update addresses an issue where certain GPU configurations might recently have experienced a system error related to dxgmms2.sys, resulting in the KERNEL_SECURITY_CHECK_FAILURE error.

• [OS Security (known issue)] Fixed: After installing the Windows security update released on or after January 13, 2026, some PCs which run Virtual Secure Mode (VSM) are unable to shut down or enter hibernation. Instead, the device restarts.

• [Windows Security] Fixed: This update addresses an issue that affected Microsoft Defender SmartScreen Application Reputation (AppRep) events from being logged. This interrupted event tracking used for advanced threat investigations.

• [Secure Boot] With this update, Windows quality updates include a broad set of targeting data that identifies devices and their ability to receive new Secure Boot certificates. Devices will receive the new certificates only after they show sufficient successful update signals, which helps ensures a safe and phased rollout.

If you've already installed previous updates, your device will download and install only the new updates included in this package.

For more information about security vulnerabilities, see the Security Update Guide and the February 2026 Security Update.

Windows 11 servicing stack update (KB5077457) - 22621.6642

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.

Known issues in this update​​​​​​​

Microsoft is not currently aware of any issues with this update.

How to get this update

Before you install this update

Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

File information

For a list of the files provided in this update, download the file information for cumulative update 5075941.   

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5077457) - versions 22621.6642.