Microsoft has released emergency Windows updates to resolve Remote Desktop Services failures caused by its September 2026 security patches. The out-of-band releases also address some Hyper-V and USB audio problems.
Affected systems experienced failed Remote Desktop connections, sign-in errors and unresponsive servers. However, the new patches do not fix every reported audio issue.
September Updates Disrupt Remote Desktop
The problems began after Microsoft released its September 2026 security updates. Administrators soon reported widespread instability affecting Remote Desktop Services.
Some users could not establish Remote Desktop Protocol connections. Others encountered sign-in failures when attempting to access affected computers and servers.
In more severe cases, entire servers stopped responding. The problem also affected several related Windows components and administrative tools.
Microsoft Management Console, RDS Licensing Diagnoser and File Explorer could become unresponsive. Additionally, some users experienced problems with the Windows Update settings page.
Microsoft acknowledged the failures and initially offered Group Policy mitigations. These measures provided temporary relief while the company prepared a permanent solution.
Some administrators also restored Remote Desktop functionality by uninstalling the September patches. However, removing those updates also removed their security fixes. Therefore, this option could expose systems to patched vulnerabilities.
Microsoft Releases Emergency Updates
Microsoft issued several out-of-band updates on September 14. The emergency Windows updates cover supported editions of Windows 10, Windows 11 and Windows Server.
Windows 10 versions 21H2 and 22H2 receive KB5129236. Meanwhile, Microsoft released KB5129195 for Windows 11 versions 24H2 and 25H2.
Devices running Windows 11 version 26H1 receive KB5129194. Microsoft also published separate packages for three Windows Server releases.
Windows Server 2019 receives KB5129238, while Windows Server 2022 receives KB5129237. The update for Windows Server 2025 is KB5129235.
The Server updates correct RDS failures introduced by KB5122882 on Windows Server 2022. They also address problems linked to KB5122871 on Windows Server 2025.
Update Availability Varies by Version
Windows 11 26H1 users can receive KB5129194 through Windows Update. Microsoft also distributes it through Windows Update for Business and the Microsoft Update Catalog.
Administrators can obtain the package through Windows Server Update Services as well.
However, the out-of-band releases for Windows Server 2019, 2022 and 2025 are available through the Microsoft Update Catalog. Administrators may need to download and deploy those packages manually.
Microsoft also released KB5129195 for Windows 11 24H2 and 25H2. Additionally, KB5129236 addresses affected Windows 10 21H2 and 22H2 systems.
Organisations should test the updates before deploying them widely. This approach can help identify conflicts with business applications or custom configurations.
Hyper-V Shared Folders Receive Fix
The emergency Windows 11 updates also resolve a Hyper-V problem. The bug affected applications that rely on virtual machines managed through Host Compute Service.
Some applications use Plan9 to share folders between a Windows host and a Linux virtual machine. After the September updates, those shared folders could disappear from the guest environment.
In other cases, the folders remained visible but became inaccessible. Consequently, applications could no longer exchange files correctly between the host and virtual machine.
The new out-of-band patches restore access to these shared locations.
Updates Repair Some USB Audio Problems
Microsoft also included a fix for certain USB audio failures. The problem affects some devices that use the USB Audio Class 1.0 standard.
Affected equipment generally continued working in ordinary two-channel stereo mode. However, it could fail when users switched to multichannel configurations.
These configurations include eight-channel sound and some 3D audio modes. The emergency updates resolve this part of the problem.
Nevertheless, separate USB Audio Class 1.0 failures remain unresolved. Some devices may still fail to start after installing the September 8 security update.
Device Manager may display a Code 10 error for affected hardware. Users can also experience no audio output, frozen volume controls or unavailable sound settings.
In some cases, volume controls remain at zero and do not respond. Microsoft says the remaining problem only affects USB Audio Class 1.0 devices.
The company continues to develop an additional fix. Until then, switching affected hardware to standard stereo may restore audio in some situations.
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