KB5077179 - Windows 11 Version 26H1 Cumulative Update (OS Build 28000.1575)
February 10, 2026 security cumulative update for Windows 11 version 26H1, delivering OS build 28000.1575 with graphics, networking, and reliability fixes.
Summary
KB5077179 is the February 10, 2026 security cumulative update for Windows 11, version 26H1, producing OS build 28000.1575. It bundles the latest security fixes alongside non-security improvements carried over from the prior month's optional preview release. The update also includes a combined servicing stack update (KB5077868). See Microsoft Support for the official page.
Highlights
- Fixes a graphics driver crash (dxgmms2.sys) that caused KERNEL_SECURITY_CHECK_FAILURE on certain GPU configurations.
- Resolves a Wi-Fi connectivity failure affecting some devices on WPA3-Personal networks.
- Addresses missing BitLocker Hardware Lab Kit (HLK) tests in the Windows Hardware Compatibility Program playlist.
- Fixes a TrustedInstaller hang that could prevent Windows from starting.
- Notes that .NET Framework 3.5 is no longer a Windows Feature on Demand optional component starting with Windows 11 version 26H1.
Improvements and fixes
- Graphics: A fix is included for a bug where specific GPU configurations could trigger a system crash tied to dxgmms2.sys, resulting in a KERNEL_SECURITY_CHECK_FAILURE stop error.
- .NET Framework 3.5: Beginning with Windows 11 version 26H1, .NET Framework 3.5 has been removed as a Windows Feature on Demand optional component. Administrators must now deploy it using the standalone installer; Microsoft provides a dedicated link for further guidance.
- Networking: A fix addresses a failure that stopped certain devices from establishing connections to WPA3-Personal Wi-Fi networks.
- OS Reliability - BitLocker HLK tests: BitLocker Hardware Lab Kit tests that were missing from the Windows Hardware Compatibility Program (WHCP) playlist are now restored and appear as expected.
- OS Reliability - TrustedInstaller: A fix prevents TrustedInstaller from becoming unresponsive in a way that would block Windows from starting up.
- AI Components: The update refreshes several AI components - Image Search, Content Extraction, Semantic Analysis, and Settings Model - all updated to version 1.2511.1224.0. These components apply only to Copilot+ PCs and will not install on standard Windows PCs or Windows Server.
Known issues
Microsoft lists no known issues for this update at the time of writing.
How to get this update
This update is delivered through multiple channels. It downloads and installs automatically via Windows Update and Microsoft Update. Organizations using Windows Update for Business will receive it in line with their configured policies. For Windows Server Update Services (WSUS), configure the Product as "Windows 11" and the Classification as "Security Updates" to sync it automatically.
For manual deployment, the standalone package is available from the Microsoft Update Catalog. The KB contains one or more MSU files that must be installed in a specific order. Microsoft documents two methods: Method 1 installs all MSU files together using DISM with a folder path, and Method 2 installs each MSU file individually in the prescribed sequence, also via DISM or the Windows Update Standalone Installer.
The servicing stack update (SSU) KB5077868 at version 28000.1575 is combined with the cumulative update package. Because the SSU is bundled, running wusa.exe /uninstall against the combined package will not work. To remove only the LCU component after installation, use DISM /online /remove-package with the LCU package name, which you can retrieve by running DISM /online /get-packages.
Devices that have already installed prior updates will download and install only the new content in this package.
Frequently asked questions
Does this update include the servicing stack, or must I install it separately?
Microsoft combines the latest servicing stack update (SSU KB5077868, version 28000.1575) directly with this cumulative update. You do not need to download or install the SSU separately before applying KB5077179; the two components are packaged together for simplified deployment.
Will the AI component updates install on all Windows 11 devices?
No. Although the AI component updates for Image Search, Content Extraction, Semantic Analysis, and Settings Model are bundled inside the package, Microsoft states they are applicable only to Copilot+ PCs. The AI components will not install on standard Windows PCs or on Windows Server systems.
Is .NET Framework 3.5 still available for Windows 11 26H1 devices?
Yes, but the delivery method has changed. Starting with Windows 11 version 26H1, .NET Framework 3.5 is no longer available as a Windows Feature on Demand optional component. IT administrators must now install it using the standalone installer. Microsoft provides a direct link (via go.microsoft.com) in the update documentation for guidance.
Can I uninstall this update if problems arise after deployment?
You can remove the LCU portion by using DISM /online /remove-package with the LCU package name identified through DISM /online /get-packages. However, because the SSU is included in the combined package, the servicing stack component cannot be removed from the system after installation. Plan rollback procedures accordingly before broad deployment.
