Microsoft’s Emergency Windows 11 Fix Tackles Major Problems
Microsoft has released an emergency Windows 11 update to repair Remote Desktop, Hyper-V file-sharing, and multichannel USB audio problems. The cumulative update also includes protection against an elevation-of-privilege vulnerability, making it an important release for affected users and IT teams.
By Rodger Mansfield, Technology Editor
September 16, 2026
A Windows update can quickly become a business problem when remote employees cannot sign in, virtual machines lose access to shared folders, or specialized audio equipment stops working correctly.
Here’s a Cool Tip: Check Windows Update now if Remote Desktop, Hyper-V, or USB audio recently stopped working.
Microsoft released KB5129195 on September 14, 2026, outside its regular update schedule.
The cumulative out-of-band update applies to Windows 11 versions 25H2 and 24H2 and brings those systems to OS builds 26200.9457 and 26100.9457, respectively.
The update addresses several issues introduced or exposed by the September 2026 Windows security updates.
The failures affected Remote Desktop Services, host-folder sharing with certain Linux virtual machines, and some multichannel USB audio configurations.
It also includes protections documented under CVE-2026-62721, a Windows User-Mode Power Service elevation-of-privilege vulnerability.























