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Microsoft Releases Emergency Windows Updates to Fix September RDS Failures

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Summary

Microsoft released emergency Windows updates to fix Remote Desktop failures caused by September security updates, plus Hyper-V and some USB audio issues. Some USB Audio Class 1.0 problems remain unresolved.

Key points

  • September 2026 security updates caused Remote Desktop Services instability, RDP connection and sign-in failures, and in some cases unresponsive servers.
  • Microsoft released out-of-band updates on September 14 for affected Windows 10, Windows 11, and Windows Server versions.
  • The issues could also affect MMC, RDS Licensing Diagnoser, File Explorer, and the Windows Update page.
  • Windows 11 updates also fix a Hyper-V problem that could make Plan9 shared folders unavailable or inaccessible in HCS-managed Linux virtual machines.
  • The updates fix some multichannel audio problems with USB Audio Class 1.0 devices, but other device-startup and audio issues remain; Microsoft says it is working on a fix.
  • Earlier Group Policy mitigations were available, and uninstalling the September updates restored Remote Desktop functionality but removed their security fixes.

Article Details

Event Type
Emergency out-of-band Windows updates released to address issues caused by the September 2026 security updates.
Impact
The September updates caused Remote Desktop Services instability and RDP connection and sign-in failures, and could leave servers and components such as MMC, File Explorer, and Windows Update unresponsive. Updates also address a Hyper-V issue affecting HCS-managed virtual machines using Plan9 shared folders and a multichannel audio issue with some USB Audio Class 1.0 devices. Some USB Audio Class 1.0 startup and audio problems remain unresolved.

Vendors

MicrosoftMicrosoft released emergency out-of-band Windows updates to fix Remote Desktop Services failures caused by September 2026 security updates, which also affected some Hyper-V and USB audio functionality.

Products

Host Compute ServiceThe out-of-band Windows 11 updates also resolve a Hyper-V issue affecting applications that use Host Compute Service (HCS)-managed virtual machines.Microsoft Hyper-VMicrosoft released emergency out-of-band Windows updates to fix Remote Desktop Services failures caused by September 2026 security updates, which also affected some Hyper-V and USB audio functionality.Microsoft WindowsMicrosoft released emergency out-of-band Windows updates to fix Remote Desktop Services failures caused by September 2026 security updates, which also affected some Hyper-V and USB audio functionality.Plan9The out-of-band updates also fix a Hyper-V issue involving HCS-managed virtual machines and Plan9 shared folders.Remote Desktop ServicesMicrosoft released emergency out-of-band Windows updates to fix Remote Desktop Services failures caused by September 2026 security updates, which also affected some Hyper-V and USB audio functionality.USB Audio Class 1.0The updates restore RDP access and address several Windows Server and Windows 11 issues while Microsoft continues working on remaining USB Audio Class 1.0 problems.Windows 10Windows 10 21H2 and 22H2: KB5129236Windows 11The updates restore RDP access and address several Windows Server and Windows 11 issues while Microsoft continues working on remaining USB Audio Class 1.0 problems.Windows ServerThe updates restore RDP access and address several Windows Server and Windows 11 issues while Microsoft continues working on remaining USB Audio Class 1.0 problems.

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