Microsoft releases emergency Windows updates to fix RDS failures

What Microsoft emergency Windows updates to fix shipped

BleepingComputer reports: Microsoft releases emergency Windows updates to fix RDS failures. Microsoft has released emergency out-of-band Windows updates to fix Remote Desktop Services failures caused by this month's security updates, along with Hyper-V and USB audio problems on some Windows versions. [...]

The September 2026 security updates caused Remote Desktop Services (RDS) to become unstable on affected systems, leading to RDP connection and sign-in failures and, in some cases, unresponsive servers. Microsoft previously acknowledged the issue after Windows administrators reported widespread RDS problems following the September updates.

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Affected systems could also experience problems with related components and tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, File Explorer, and the Windows Update page, which could stop responding. The company had previously provided Group Policy mitigations for affected Windows and Windows Server systems while it worked on a permanent fix.

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Administrators also reported that uninstalling the September security updates restored Remote Desktop functionality, but it also removed the security fixes included with those updates. See the full write-up from BleepingComputer via the source link for quotes and complete context.

The Windows 11 26H1 update, KB5129194, is available through Windows Update, Windows Update for Business, the Microsoft Update Catalog, and Windows Server Update Services (WSUS). For Windows Server 2019, Windows Server 2022 and Windows Server 2025, the out-of-band updates are available through the Microsoft Update Catalog.

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Microsoft also released KB5129195 for Windows 11 24H2 and 25H2 and KB5129236 for Windows 10 21H2 and 22H2 to address the RDS failures affecting those systems. Hyper-V and multichannel audio fixes The out-of-band Windows 11 updates also resolve a Hyper-V issue affecting applications that use Host Compute Service (HCS)-managed virtual machines.

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Microsoft says some applications experienced problems when sharing Windows host folders with Linux virtual machines using Plan9, causing shared folders to either not appear inside the guest environment or become inaccessible. See the full write-up from BleepingComputer via the source link for quotes and complete context.