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Windows 11's September update broke audio. That's not the only thing.

Microsoft confirmed KB5124008 and KB5124012 kill USB Audio Class 1.0 devices on Windows 11 24H2 and later. There’s no fix yet, and the audio bug is one item on a longer list. Your speakers didn’t die.
ZDNet

The latest Windows 11 update may mess with your device’s audio – here’s the workaround

Microsoft’s monthly Windows updates aim to fix bugs and vulnerabilities, but they also often create new glitches. That’s the case with the September Patch Tuesday rollout, which is apparently stifling ...
TweakTown

Microsoft confirms Windows 11 September update kills audio output on some PCs

Microsoft says KB5124008 (Sept. 8) can disable USB Audio Class 1.0 devices on Windows 11 (24H2, 25H2, 26H1), causing Code 10 errors, muted output, and unresponsive sound controls; multichannel modes ...
BleepingComputer

Microsoft: September updates break audio on some Windows PCs

Microsoft has confirmed that USB audio devices may fail on some Windows systems after installing the KB5124008 and KB5124012 September 2026 security updates. This known issue affects only devices ...