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Last week, Microsoft released its routine September 2026 updates for every supported product. Among them, the Windows 11 24H2/25H2 update KB5124008 has, once installed, provoked several functional anomalies on devices. The problems Microsoft has already confirmed include certain USB audio devices failing to start or output sound, alongside malfunctions in features such as virtual machines and remote desktop.
USB Audio Devices May Stop Working
In its support documentation, Microsoft confirmed that some USB Audio Class 1.0 devices may fail to start or play sound after the update. Affected devices may display “This device cannot start (Code 10)” in Device Manager. Moreover, the volume controls may cease to function, and the sound settings page may even become unresponsive. The full advisory appears on Microsoft’s KB5124008 support page for Windows 11 24H2 and 25H2.
Some devices still work in stereo mode, yet after switching to multichannel, 8-channel, or 3D audio modes, they may output no sound at all. Microsoft therefore advises affected users to try switching to two-channel mode. In due course, the company will devise a fix and release an update to resolve the issue.
Remote Desktop Services and VM Sharing Malfunction
This update has also rendered Remote Desktop Services unstable on some enterprise devices. Consequently, users may frequently encounter failures, login anomalies, prolonged waits on the “configuring remote desktop” page, and unresponsiveness in File Explorer and the management console.
For those using the WSL subsystem or other Hyper-V-based virtual machines, Microsoft has likewise confirmed that Linux VMs relying on the Plan9 sharing mechanism may be unable to access host folders. The related problem affects some applications that manage VMs through HCS, such as Claude Cowork.
Many Unconfirmed Problems Remain
Beyond these confirmed issues, users have also reported Windows 11 File Explorer crashes, a black screen after login, File History failing to recognize the backup drive, and AMD graphics cards suffering driver timeouts. These problems still await Microsoft’s confirmation, and it remains unclear whether they are isolated cases or a widespread affliction.
Among them, File History matters greatly to some office users. The feature automatically backs up the revised versions of files, so a failure to recognize the backup drive renders the backup function inoperative. Users are therefore advised to keep their data well backed up during daily work, lest they alter or lose a file and find no earlier version to recover.
Uninstalling Is Easy but Carries Security Risk
KB5124008 is a routine security update that mends a great many security flaws. For users encountering the above problems, uninstalling the update resolves them. The catch, however, is that removing it may leave the system exposed, so enterprise users should weigh the decision carefully before rolling it back.
Microsoft is currently continuing to gather user feedback and to devise various solutions. For home users, if a truly disruptive problem arises, one may uninstall KB5124008 for now to restore normal use.
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