Windows 10 KB5049981 was released on January 14, 2025, as a security and quality update. It updated Windows 10 version 22H2 to build 19045.5371 and Windows 10 Enterprise/IoT Enterprise LTSC 2021 to build 19044.5371. Microsoft now marks the update expired: since March 31, 2026, it has not been available through the Microsoft Update Catalog or other release channels. There is no current official direct .msu download.
Which Windows 10 versions received KB5049981?
Microsoft lists KB5049981 for Windows 10 version 22H2, all editions, and Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021. The release appeared on both the 19045 General Availability Channel track and the 19044 LTSC track.
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| Windows edition or servicing branch | Resulting OS build | Version identification |
|---|---|---|
| Windows 10 version 22H2, all editions | 19045.5371 | Microsoft identifies KB5015684 as the enablement package for version 22H2. |
| Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021 | 19044.5371 | For supported 21H2 editions, Microsoft identifies KB5003791. |
These are separate servicing tracks; the build number depends on the Windows edition and branch. See Microsoft’s KB5049981 release notes and Windows 10 release information for the applicable version details.
What did the update change?
Microsoft described KB5049981 as a security update with quality improvements. For Windows 10 version 21H2 LTSC editions, it added drivers considered at risk of Bring Your Own Vulnerable Driver attacks to the Windows Kernel Vulnerable Driver Blocklist, DriverSiPolicy.p7b. For version 22H2, the release notes document no additional issues for this release.
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What issues did Microsoft document?
Microsoft’s release notes describe several issues associated with this update or updates released around the same time. The listed fixes are later updates, not substitutes for downloading the expired KB5049981 package.
- Citrix Session Recording Agent 2411: Some devices could download and apply the update, then roll back during restart. Microsoft says Citrix Session Recording Agent version 2503, released April 28, 2025, and later resolves the issue. Home users were not expected to be affected.
- SgrmBroker.exe and Event 7023: Event Viewer could report a System Guard Runtime Monitor Broker service error after updates released January 14, 2025, or later. Microsoft says it is otherwise silent and should not affect performance or functionality.
- USB audio and cameras: Microsoft listed problems affecting some USB audio devices, especially devices using USB 1.0 audio driver-based DACs, and USB cameras that might not be recognized as on. The notes identify KB5050081 as addressing these problems.
- OpenSSH: The notes also mention an existing OpenSSH service startup issue reported after the October 2024 update and identify KB5052077 as its resolution.
For current status and the precise scope of each issue, consult the Microsoft KB5049981 notes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you still download KB5049981 as an .msu?
No. Microsoft states that as of March 31, 2026, KB5049981 is no longer available from the Microsoft Update Catalog or other release channels. A January 2025 article that linked to Catalog downloads documents the package’s original availability; it does not establish that those downloads remain available today.
Do not rely on an unofficial mirror or assume that a similarly named update is interchangeable with KB5049981. Microsoft recommends updating devices to the latest Windows version. For current installation and update options, use Microsoft’s Windows support and update guidance.
Quick Recap
How to check which Windows build is installed
- Press Windows key + R, type winver, and press Enter.
- Check the dialog for the Windows version and OS build. A device updated by KB5049981 would have shown build 19045.5371 on version 22H2 or build 19044.5371 on the LTSC 2021 track.
- If you need updates now, use Windows Update and Microsoft’s current guidance rather than searching for the expired KB5049981 package.
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