Microsoft releases urgent Windows 11 update to address major patch issues.

Microsoft has begun deploying an emergency out-of-band update to tackle issues stemming from its massive September Patch Tuesday rollout. This update was notable for addressing nearly 1,000 vulnerabilities, making it the largest patch ever, but it also inadvertently introduced some bugs impacting businesses, developers, and gamers alike.

The September update caused problems with folder shares on Hyper-V-based Linux virtual machines, Remote Desktop Services sessions, and certain USB audio devices. The newly released out-of-band update, which came out yesterday, aims to resolve these issues across Windows 11 versions 26h1, 25H2, and 24H2. Additionally, updates have been made available for Windows Server 2025 and 2022, the LTSC versions of Windows 10, as well as Windows Server 2012 and 2012 R2.

Historically, Microsoft rarely issued out-of-band updates for Windows, but this year has seen a shift in that trend. Earlier in January, the company had to roll out four such updates following a problematic Windows 11 patch. In March, two emergency updates were necessary due to installation failures and Microsoft account sign-in issues. Furthermore, an out-of-band update was released in July to fix an Intel driver problem that was leading to performance drops and battery drain.