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Windows Server 2016 Windows Server 2016 Out-of-band update
Out-of-band

KB5129239

KB5129239: Cumulative update for Windows Server, version 2016, September 2026. Remote Desktop failures and multichannel USB audio fixed

In short

Fixes Remote Desktop failures and USB audio problems in 8-channel and 3D modes. Other USB Audio Class 1.0 symptoms remain unresolved.

Does it affect you? Applies to: Devices running Windows Server 2016. The update package is for x64 systems.

Build
14393.9514
Restart
Required
Review notes Additional details from the official release notes (3) Read notes
  • What changes This update fixes the reported Remote Desktop Services issue that could occur after installing the September 2026 security update, KB5123099, in affected environments.
  • What changes The update fixes the 8-channel and 3D audio symptoms on affected USB Audio Class 1.0 devices.
  • Known issues The remaining symptoms can affect some USB Audio Class 1.0 devices; the source does not restrict the issue to business users.

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

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 connection and sign-in failures are fixed. Servers and related tools no longer become unresponsive during Remote Desktop configuration.1
    Addresses RDS instability after KB5123099, including failures in RDP connections and sign-ins and unresponsiveness in Microsoft Management Console, RDS Licensing Diagnoser, File Explorer, and the Windows Update page.

8-channel or 3D audio modes

Verified in package

For: Devices using USB Audio Class 1.0 audio

  • USB Audio Class 1.0 devices work again in 8-channel and 3D audio modes.2
    Resolves the multichannel audio symptoms on USB Audio Class 1.0 devices; other audio symptoms are not resolved by this update.

Known issues

  1. Resolved Affects: Organizations and IT administrators Resolved by KB5129239

    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 still fail to start or produce audio. Symptoms can include a Code 10 error, no audio output, unresponsive volume controls, or unavailable sound settings. KB5129239 resolves the symptoms with 8-channel or 3D audio modes, but not the other symptoms.3

    How to apply the workaround Workaround

    For symptoms this update does not resolve, IT administrators can contact Microsoft Support for Business for assistance.3

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
KB5123099, KB5120418, KB5099535, KB5094122
+24 earlier KB5087537, KB5091572, KB5082198, KB5078938, KB5075999, KB5073722, KB5074974, KB5071543, KB5068864, KB5070882, KB5066836, KB5065427, KB5063871, KB5062560, KB5061010, KB5058383, KB5058921, KB5055521, KB5053594, KB5052006, KB5049993, KB5048671, KB5046612, KB5037423
Replaced by
KB5126868
VersionBuildChannel
2016 14393.9514 General availability

Security

No vulnerabilities are listed for this update.

Updated components

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

Top changed componentsFiles
Remote Desktop5
Audio1
Kernel1
Printing1

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 (KB5129239)

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update (KB5123099). 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 OOB update resolves the symptoms experienced on devices using 8-channel or 3D audio modes (last bullet point in the list of symptoms documented in this entry). We are working to address the other symptoms learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 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 3/5, 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