Microsoft releases emergency Windows updates to fix RDS failures

Source: BleepingComputer

Author: Lawrence Abrams

URL: https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-emergency-windows-updates-to-fix-rds-failures/

ONE SENTENCE SUMMARY:

Microsoft issued out-of-band Windows updates to fix September 2026 security-update regressions breaking RDS, plus Hyper-V and USB audio issues.

MAIN POINTS:

  1. September 2026 security updates destabilized Remote Desktop Services, causing RDP sign-in and connection failures.
  2. Some impacted servers became unresponsive, indicating severe service disruption beyond simple login issues.
  3. Related tools like MMC, Licensing Diagnoser, File Explorer, and Windows Update could hang.
  4. Out-of-band fixes shipped September 14 to remediate the introduced regressions.
  5. Windows Server 2025 failures traced to KB5122871; Windows Server 2022 issues tied to KB5122882.
  6. Temporary mitigations were previously provided via Group Policy while engineering developed permanent patches.
  7. Uninstalling September updates restored Remote Desktop, but removed included security protections.
  8. Windows 11 26H1 KB5129194 is distributed via WU, WUfB, Catalog, and WSUS.
  9. Server out-of-band updates for 2022/2025 are offered through the Microsoft Update Catalog only.
  10. Additional OOB updates include KB5129195 (Win11 24H2/25H2) and KB5129236 (Win10 21H2/22H2).

TAKEAWAYS:

  1. Treat Patch Tuesday deployments cautiously; critical regressions can break core remote administration paths.
  2. Use Microsoft’s out-of-band patches rather than rolling back security updates when feasible.
  3. Validate RDS plus management tooling after updates, not just RDP connectivity.
  4. Hyper-V Plan9 shared-folder issues and multichannel USB audio failures are also addressed in Windows 11 OOB updates.
  5. Remaining USB Audio Class 1.0 “Code 10/no audio” problems persist, with a future fix pending.