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Windows Server 2019 Windows Server 2019 Out-of-band update
Out-of-band

KB5129238

KB5129238: Cumulative update for Windows Server, version 2019, September 2026. Remote Desktop instability addressed; 8-channel USB audio restored

In short

Addresses Remote Desktop instability and restores 8-channel or 3D audio on affected USB Audio Class 1.0 devices. Other USB audio symptoms might remain.

Does it affect you? Applies to: Devices running Windows Server 2019.

Build
17763.9247
Restart
Required

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Fixes 2 changes

Remote Desktop Services (known issue)

Verified in package
  • Remote Desktop connections and sign-ins work more reliably in affected environments; servers and related tools are less likely to become unresponsive during Remote Desktop configuration.1
    Addresses RDS instability after KB5122876, including failures in Microsoft Management Console (MMC), RDS Licensing Diagnoser, File Explorer, and the Windows Update page.

8-channel or 3D audio modes

Verified in package
  • Some USB Audio Class 1.0 devices work again when using 8-channel or 3D audio modes.2
    Resolves the symptoms on USB Audio Class 1.0 devices using these audio modes; other audio symptoms are not resolved by this update.

Improvement 1 change

Servicing stack

  • The update improves certificate checks when verifying whether a device is hosted on Azure.3
    The included servicing stack update uses an updated certificate chain to verify whether a device is hosted on Azure.

Known issues

  1. Resolved Affects: Everyone Resolved by KB5129238

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

    After the September 8, 2026 security update, some USB Audio Class 1.0 devices might fail to start or produce audio, show Code 10, or have unresponsive volume controls or sound settings. This update resolves symptoms on devices using 8-channel or 3D audio modes; other symptoms might remain.4

    How to apply the workaround Workaround

    IT administrators who need an immediate workaround for the symptoms not addressed by this update should contact Microsoft Support for Business.4

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
+24 earlier KB5087538, KB5091573, KB5082123, KB5078752, KB5075904, KB5078131, KB5077795, KB5073723, KB5074975, KB5071544, KB5068791, KB5070883, KB5066586, KB5065428, KB5066187, KB5063877, KB5062557, KB5060531, KB5061978, KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5126651
VersionBuildChannel
2019 17763.9247 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 2019
856.9 MB
windows10.0-kb5129238-x64.msu Main update · KB5129238 SHA-1: 0160d868…72730b

Updated components

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

Top changed componentsFiles
Audio1
Remote Desktop1

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 (KB5122876). 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. This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation. support.microsoft.com
  4. 4. This issue is partially resolved in the out-of-band (OOB) update released on September 14, 2026. This OOB update resolves the symptoms experienced on devices using 8-channel or 3D audio modes. 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 5/5. 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