Windows 11 25H2 and 24H2 Out-of-Band Update

 

Microsoft released Out-of-Band (OOB) update KB5129195 (OS 26200.9457 and 26100.9457) for Windows 11 versions 25H2 and 24H2 on September 14, 2026. The update includes updates from previous releases, along with additional security and non-security improvements. 

Improvements

This OOB update includes the following improvements:

• [Security] This update includes protections documented in CVE-2026-62721, which refers to a Windows User-Mode Power Service (UMPS) Elevation of Privilege vulnerability.
• [Remote Desktop Services (known issue)] Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update (KB5122880). 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. See the “Known issues in this update” section for more information.)

Component updates
Windows 11 servicing stack update (KB5124007) - 22621.9441
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.

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.

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...

Microsoft September 2026 Security Updates

 

The Microsoft September 2026 security updates have been released and consist of 997 updates relating Microsoft, Chromium and non-Microsoft products.

Of the Microsoft CVEs released, 114 are rated Critical, 5 as low and the rest are rated Important in severity. 

At the time of release, seven are listed as being under active attack. As Indicated Dustin Childs below-linked post, 20 different patches could all be classified as wormable. "In each of these cases, a remote, unauthenticated attacker could get arbitrary code execution on affected systems with no user interaction. While some might be more exploitable than others, having 20 of them in a single release is something else."

The security updates apply to the following products, features and roles: Windows and Windows components, Office and Office Components, Azure and Azure Components, .NET and Visual Studio, Active Directory, Copilot Studio, Dynamics, Edge (Chromium-based), DHCP Server and Client, DNS Server, Exchange Server, Teams for Android, OpenSSH, Remote Desktop Client and Server, Skype for Business, Biometric Service, SQL Server, Windows Hello, Xbox, and Defender.

Information regarding known issues with KBs included in the security updates can be found at the bottom of the page at September 2026 Security Updates - Release Notes - Security Update Guide - Microsoft.

Recommended Reading:  See Dustin Childs complete review and analysis in Zero Day Initiative -- The September 2026 Security Update Review.

Additional Update Notes:

• Windows 10 -- See Windows 10 Extended Security Updates (ESU).
• Servicing Stack Updates -- Microsoft now combines the latest servicing stack update (SSU) for your operating system with the Latest Cumulative Updates (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
  
• Windows updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows, in addition to non-security updates. The updates are also available via search for the KB number in the Microsoft Update Catalog.
• For information on lifecycle and support dates for Windows 11 operating systems, please see Windows 11 Home and Pro.
• Windows Update History:  Windows 11, Windows 10

 

References

• Security Update FAQ
• Security Updates Guide

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...

Mozilla Firefox Version 155.0.1 Released

 Mozilla sent Firefox Version 155.0.1 to the release channel. 

From the Release Notes, the update includes four fixes and one unresolved issue where standard dynamic range (SDR) video in some formats can appear washed out on macOS. 

Update:  To get the update now, select "Help" from the Firefox menu and pick "About Firefox".  Mac users need to select "About Firefox" from the Firefox menu.  If you do not use the English language version, Fully Localized Versions are available for download.

Rapid Release Calendar

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...