Microsoft released the Windows 10 KB5126657 extended security update, which includes this month’s record-breaking October 2026 Patch Tuesday fixes and a few bug fixes and changes.
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a ‘Check for Updates.’
After installing this update, Windows 10 will be updated to build 19045.7807, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7807.
Microsoft no longer releases new features for Windows 10, and the KB5126657 update mainly includes security updates and bug fixes.
The update also includes fixes released as part of today’s record-breaking October 2026 Patch Tuesday, which fixed a massive 1,411 vulnerabilities across Microsoft’s products, including one actively exploited zero-day flaw.
The complete list of fixes and changes in KB5126657 is listed below:
Microsoft says the update has a known issue affecting some USB Audio Class 1.0 devices after installing the September 2026 Windows security updates.
Affected devices may fail to start with a Code 10 error in Device Manager, stop producing audio, or experience unresponsive volume controls and sound settings. Some devices may also work in standard stereo mode but fail when using 8-channel or 3D audio configurations.
Microsoft partially fixed the issue in an emergency out-of-band update released on September 14, which addressed problems with 8-channel and 3D audio modes.
However, other audio issues remain unresolved, and Microsoft says it is working on additional fixes.
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