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Microsoft Resolves USB Audio Failures Introduced by September 2026 Security Updates

Microsoft has confirmed that the November 2026 cumulative updates fix USB audio problems that began appearing after the September 2026 Patch Tuesday releases. The issues affected USB Audio Class 1.0 devices on both client systems running Windows 10 and Windows 11 as well as server platforms starting with Windows Server 2012. Symptoms included devices failing to start, Code 10 errors in Device Manager, unresponsive volume controls, and loss of multichannel features such as 3D audio or 8-channel output. Microsoft previously issued out-of-band fixes on September 14 for the multichannel-specific problems and has now addressed the remaining cases in the November security updates. Users who cannot install the updates immediately can mitigate the problem by switching affected devices to 2-channel mode. The company also resolved separate Outlook sign-in and mail delivery issues on Exchange Server systems caused by the October 2026 updates.