Microsoft has released an emergency out-of-band update for Windows 11 to fix bugs following the September patch. This package became the largest in the company's history, closing nearly 1,000 vulnerabilities but also introducing several noticeable bugs. The update addresses issues in Windows 11 versions 26H1, 25H2, and 24H2, as well as in Windows Server 2025/2022, Windows 10 LTSC, and Server 2012/R2.
The main issue affected owners of AMD Radeon graphics cards: systems with these GPUs began to crash due to driver instability after the update. Reinstalling the driver does not help, and complaints cover most current Radeon models, while the hotfix description does not directly mention AMD.
Also confirmed and partially fixed are: unstable operation of the Remote Desktop Services (RDS); loss of sound output and microphone failure, launching audio devices with distorted configurations; black screen in Explorer after logging into an account; inability of 'File History' to detect external drives. As a workaround for sound issues, users switched devices to a 2.0 configuration – Microsoft claims that the failure has been resolved in the hotfix. Additionally, the non-functionality of Claude Cowork due to the failure of the Linux VM with shared Plan9 folders has been separately fixed. The September patch, in addition to fixes, restored the movable taskbar, added customizable Start menu layouts, revamped search, and taught Explorer to display file sizes in KB, MB, and GB.
HP and Lenovo computer owners are advised to hold off on installation: problems have persisted since the August patch and intensified with September's. On HP devices, cases of BIOS corruption have been recorded, after which installation fails and the system cannot be restored; the manufacturer has already released a new BIOS revision. Lenovo users experience black screens or sudden shutdowns, presumably due to incorrect power management.
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