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Windows 10 1809 Windows 10 1809 Out-of-band update
Out-of-band

KB5129238

KB5129238: Cumulative update for Windows 10, version 1809, September 2026. Remote Desktop failures and multichannel USB audio fixed

In short

Addresses Remote Desktop connection and sign-in failures and fixes 8-channel or 3D audio problems on some USB Audio Class 1.0 devices.

Does it affect you? Applies to: Devices running Windows 10 Enterprise LTSC 2019, version 1809, on x86 or x64.

Build
17763.9247
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • What changes The bundled servicing stack update adds logic to verify whether a device is hosted on Azure, using an updated certificate chain.

The official sources are linked at the end of the page.

Microsoft publishes separate notes for this KB for Windows Server.

What changes

Fixes 2 changes

Remote Desktop Services (known issue)

Verified in package
  • Addresses Remote Desktop connection and sign-in failures, instability, and servers becoming unresponsive during Remote Desktop configuration.1
    Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, File Explorer, and the Windows Update page, might also stop responding.

8-channel or 3D audio modes

Verified in package
  • Some USB Audio Class 1.0 devices work again with 8-channel or 3D audio modes.2
    Addresses failures when using multichannel audio features, including 8-channel or 3D audio modes; other USB Audio Class 1.0 symptoms are not resolved by this update.

Known issues

  1. Resolved Affects: Everyone Resolved by KB5129238

    USB Audio Class 1.0 devices with error Code 10 or no output

    The issue is only partly resolved: KB5129238 fixes the 8-channel and 3D audio symptoms, while other symptoms on USB Audio Class 1.0 devices remain.3

    How to apply the workaround Workaround

    For symptoms not addressed by this update, IT administrators can contact Microsoft Support for Business.3

  2. Resolved Affects: Everyone Resolved by KB5126651

    File History might stop working after installing September 2026 Windows update

    Some customers using File History might have been unable to create or update backups after the September 2026 Windows security update. This issue is resolved by KB5126651.4

    Resolution Fixed in KB5126651

    Install KB5126651 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-09-14
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5122876, KB5120238, KB5099538, KB5094123
+23 earlier KB5087538, KB5091573, KB5082123, KB5078752, KB5075904, KB5078131, KB5077795, KB5073723, KB5074975, KB5071544, KB5068791, KB5066586, KB5065428, KB5066187, KB5063877, KB5062557, KB5060531, KB5061978, KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5126651
VersionBuildChannel
1809 17763.9247 General availability

Security

No vulnerabilities are listed for this update.

Updated components

33 files changed since the previous update for the same versions.

Top changed componentsFiles
Audio2
Remote Desktop2

Verified in package: changed files confirm Remote Desktop Services (known issue), 8-channel or 3D audio modes.

Page history

  1. Known issue resolved: USB Audio Class 1.0 devices with error Code 10 or no output (KB5129238)

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. [Remote Desktop Services (known issue)] Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update support.microsoft.com
  2. 2. [8-channel or 3D audio modes] Fixed: Some USB Audio Class 1.0 devices functioning as expected in standard stereo configurations failed when using multichannel audio features, including 8-channel or 3D audio modes. support.microsoft.com
  3. 3. IT administrators who need an immediate workaround for the symptoms not addressed yet by the OOB update should contact Microsoft Support for Business for assistance. support.microsoft.com
  4. 4. This issue is resolved in Windows updates released on and after October 13, 2026 such as KB5126651. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Nov 13, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake