October 2026 Windows 11 Updates

Update by Version

Known Issues

• USB audio devices might fail to start or produce no sound

  Partly fixed

  Affects: 26H2, 26H1, 25H2, 24H2, 23H2, and Windows 10

  Began with the September 8 security update and affects some USB Audio Class 1.0 devices, which might show Code 10 in Device Manager. An out-of-band update fixed the 8-channel and 3D audio symptoms. Microsoft is still working on the rest.

  Related guideMicrosoft source

• Remote Desktop connections might fail for non-admin users with error 0xC000000D

  Fixed

  Affects: 26H2, 26H1, 25H2, 24H2

  Affects non-admin users connecting to a PC with Administrator protection turned on, which is mostly managed work devices. Fixed by the October 28 optional preview, KB5127936, on 26H2 and 25H2.

  Related guideMicrosoft source

• You might be unable to turn on Smart App Control

  Fixed

  Affects: 26H2, 25H2, 24H2

  Some devices cannot turn Smart App Control back on in Windows Security. Devices where it is already on are not affected. KB5127936 fixes this on 26H2 and 25H2. On 24H2, the KB article lists workarounds.

  Microsoft source

Fixed by This Update

• Black screen or desktop loading issues after sign-in, seen mainly on Azure Virtual Desktop hosts. Source
• Apps that need AC-3 (Dolby Digital) audio decoding closing unexpectedly, mostly older apps. Source

Later This Month