Microsoft issues emergency fixes for broken Remote Desktop Services

Microsoft has issued emergency updates to correct severe malfunctions in Remote Desktop Services (RDS) that emerged after the September 2026 security updates. These fixes also address certain problems in Hyper-V and USB audio functionality across multiple Windows versions, though not every issue has been resolved. The instability affected user connections via RDP and prevented logins, with some servers becoming completely non-responsive. Microsoft first confirmed the problem on September 14, offering temporary Group Policy adjustments before delivering permanent solutions. Additional failures were reported in related components, including the Microsoft Management Console (MMC), File Explorer, and the Windows Update interface.

Earlier, administrators discovered that removing the September updates temporarily restored RDS operations, but this removed the security protections those updates provided. The new fixes—KB5129236 for Windows 10 (21H2, 22H2) and KB5129195 for Windows 11 (24H2, 25H2)—directly target the RDS failures. Separate updates for Windows Server address issues caused by KB5122871 (Server 2025) and KB5122882 (Server 2022).

Updates for Windows 11 26H1 (KB5129194) are available through Windows Update, the Microsoft Update Catalog, and WSUS. Server updates for versions 2019, 2022, and 2025 can also be obtained from the catalog. Beyond RDS, the patches resolve a Hyper-V issue where shared folders between Windows hosts and Linux virtual machines either failed to appear or became inaccessible. They also correct audio problems with USB Audio Class 1.0 devices in multichannel configurations, though stereo functionality remains unaffected.

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Microsoft has stated that these updates do not fully eliminate all USB audio problems. Some devices may still fail to initialize or produce sound, displaying errors such as “This device cannot start (Code 10)” in Device Manager. Volume controls and sound settings may also remain non-responsive. The company continues to investigate these lingering issues but has not announced a timeline for a complete resolution.

While the emergency updates restore essential RDS functionality and partially resolve Hyper-V and audio-related problems, organizations depending on these services should test compatibility before applying them. The fixes prioritize system stability over immediate security updates, leaving some vulnerabilities unresolved until additional patches are released. For the time being, the focus remains on reducing disruptions caused by the September updates.