Windows 11 September Update Breaks Some USB Audio Devices

Microsoft has acknowledged that its September Patch Tuesday security update, identified as KB5124008, is causing audio problems for some Windows 11 users. The company says the issue affects computers using USB Audio Class 1.0 devices, which may fail to start or produce audio after the update is installed.

The problem is listed under the "Known issues in this update" section of Microsoft's support page. According to the company, affected devices may experience one or more symptoms, though the exact nature of those symptoms is not fully detailed in the available information.

Microsoft has not disclosed how many users or systems are impacted. The company only states that "some" computers with USB Audio Class 1.0 devices are reportedly affected. The issue appears to be limited to that specific class of USB audio hardware.

The affected Windows 11 versions are 25H2 and 24H2, as well as 26H1 through a separate update, KB5124012. This means the problem spans multiple recent builds of the operating system, potentially affecting a broad range of users who rely on USB audio peripherals.

As of the time of the original report, there is no known workaround for the issue. Microsoft says it is working on a resolution and will update its support page once more information becomes available. Until then, users experiencing the problem have no official fix to apply.

The original article was published by PCWorld and later appeared on its sister publication PC-WELT, translated and localized from German. This summary is based on that reporting.

For users who depend on USB audio devices—such as external sound cards, microphones, or headsets—the issue could be disruptive. However, without specific details on which devices are affected or how widespread the problem is, it is difficult to assess the full impact. Microsoft's confirmation is a clear acknowledgment of a bug, but the lack of a workaround means affected users must wait for a fix.

It remains unclear whether Microsoft will release an out-of-band patch or include a fix in the next monthly update. The company has not provided a timeline for a resolution.

This situation highlights the challenges of maintaining compatibility across a diverse ecosystem of hardware and software, especially when security updates are pushed to millions of devices. For now, Windows 11 users with USB Audio Class 1.0 devices should be aware of the potential issue, though no action is recommended beyond monitoring Microsoft's support page for updates.

We will continue to follow this story as more information becomes available.