Overview
- Microsoft's record-sized September Patch Tuesday release on Sept. 8 included hundreds of security fixes and soon after caused failures in Remote Desktop Services, USB audio, Hyper-V folder sharing and Excel paste operations.
- Microsoft acknowledged the RDS instability and other breakages and published Group Policy mitigations and VM restart guidance for administrators to use while it developed a fix.
- On Sept. 14–15 Microsoft rolled out cumulative out-of-band updates (for example KB5129194 and KB5129195) through Windows Update, WSUS and the Microsoft Update Catalog to repair RDS, many Hyper-V Plan9 sharing faults, multichannel USB audio problems and a second User‑Mode Power Service privilege fix.
- Several problems remain unpatched, including reports of AMD GPU driver timeouts and black screens, explorer.exe/File History failures and a persistent USB Audio Class 1.0 Code 10 no‑audio error, leaving admins to choose between applying emergency updates, using mitigations, or rolling back the Sept. 8 fixes and losing security protections.
- Security agencies and vendors link the surge in September fixes to faster vulnerability discovery driven by AI tools, increasing pressure on IT teams to test updates, use staged rollout pipelines and weigh short‑term availability against urgent remediation needs.