- 22H2 (all editions with Extended Security Updates (ESU)),
- 21H2 (LTSC and IoT LTSC Editions),
- 1809 (LTSC and IoT LTSC Editions), and
- 1607 (LTSC and IoT LTSC Editions).
In this article, all new features and improvements are listed.
Windows 10 version 22H2/21H2 | KB5129236 (OS Builds 19045.7727 and 19044.7727) Out-of-band
This out-of-band update includes fixes and quality improvements that are part of the following updates:
- September 8, 2026—KB5122878 (OS Builds 19045.7725 and 19044.7725)
- Extended Security Updates (ESU) Licensing Preparation Package for Windows 10
The following is a summary of the issues that this out-of-band update addresses when you install this update. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change.
- [Remote Desktop Services (known issue)] Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update (KB5122878). In affected environments, RDS might become unstable, causing RDP connection and sign-in failures or servers to become unresponsive during Remote Desktop configuration. Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, File Explorer, and the Windows Update page, might also stop responding.
- [Hyper-V (known issue)] Fixed: Some applications that use HCS-managed virtual machines experienced issues when sharing host folder with Linux VMs using Plan9. Folders shared from the Windows host using Plan9 did not appear or could not be accessed in the guest environment.
- [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. (Note: There are other audio symptoms not resolved in this OOB update.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
Known issues in this update
- USB Audio Class 1.0 devices with error Code 10 or no output
Symptoms: After installing the September 8, 2026, Windows security update, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
The device displays an error in Device Manager: "This device cannot start (Code 10).”
No audio output.
Volume controls are unresponsive or remain at zero.
Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Resolution
Microsoft is working on a resolution and will update this documentation when more information is available.
Component updates
Windows 10 servicing stack update (KB5122877) - version 19041.7714
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improves the reliability of the update process and includes fixes to the servicing stack, the component that installs Windows updates.
Windows 10 version 1809 | KB5129238 (OS Build 17763.9247) Out-of-band
This out-of-band update includes fixes and quality improvements that are part of the following update:
- September 8, 2026—KB5122876 (OS Build 17763.9245)
The following is a summary of the issues that this out-of-band update addresses when you install this update. The bold text within the brackets indicates the item or area of the change.
- [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). In affected environments, RDS might become unstable, causing RDP connection and sign-in failures or servers to become unresponsive during Remote Desktop configuration. 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] 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. (Note: There are other audio symptoms not resolved in this OOB update.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
Known issues in this update
- USB Audio Class 1.0 devices with error Code 10 or no output
Symptoms: After installing the September 8, 2026, Windows security update, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
The device displays an error in Device Manager: "This device cannot start (Code 10).”
No audio output.
Volume controls are unresponsive or remain at zero.
Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Resolution
Microsoft is working on a resolution and will update this documentation when more information is available.
Component updates
Servicing stack update (KB5122875) - 17763.9242
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improves the reliability of the update process and includes fixes to the servicing stack, the component that installs Windows updates.
Windows 10 version 1607 | KB5129239 (OS Build 14393.9514) Out-of-band
This out-of-band update includes fixes and improvements that are a part of the following update:
- September 8, 2026—KB5123099 (OS Build 14393.9512)
The following is a summary of the issues that this out-of-band update addresses. The bold text within the brackets indicates the item or area of the change.
- [Remote Desktop Services (known issue)] Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update (KB5123099). In affected environments, RDS might become unstable, causing RDP connection and sign-in failures or servers to become unresponsive during Remote Desktop configuration. 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] 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. (Note: There are other audio symptoms not resolved in this OOB update.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
Known issues in this update
- USB Audio Class 1.0 devices with error Code 10 or no output
Symptoms: After installing the September 8, 2026, Windows security update, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
The device displays an error in Device Manager: "This device cannot start (Code 10).”
No audio output.
Volume controls are unresponsive or remain at zero.
Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Resolution
Microsoft is working on a resolution and will update this documentation when more information is available.
Component updates
Servicing stack update (KB5122874) - 17763.9242
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improves the reliability of the update process and includes fixes to the servicing stack, the component that installs Windows updates.
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