Microsoft Issues Emergency Fix for Windows Patch Tuesday Bugs

Microsoft released an emergency out-of-band update for Windows 11 and Windows Server to resolve bugs introduced by its September Patch Tuesday update. The original update was record-breaking in scope, patching nearly 1,000 flaws, but it inadvertently caused malfunctions across several systems.

Technical issues affected Remote Desktop Services sessions, USB audio devices, and folder shares on Hyper-V-based Linux virtual machines. The emergency fix targets Windows 11 versions 26h1, 25H2, and 24H2, as well as Windows Server 2025, 2022, 2012, and 2012 R2, including LTSC versions of Windows 10.

This incident follows a pattern of increased emergency patching for the company throughout 2026. Microsoft previously issued out-of-band updates in January, March, and July to address installation failures, account sign-in problems, and Intel driver performance issues.