Win Update KB5129195 Windows 11 Out-of-band Cumulative Update build 26100.9457 (24H2), 26200.9457 (25H2), and 26300.9457 (26H2) - Sept. 14


UPDATE 9/22:
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KB5124010 Windows 11 Cumulative Update Preview build 26100.9550 (24H2), 26200.9550 (25H2), and 26300.9550 (26H2) - Sept. 22

UPDATE 10/13: https://www.elevenforum.com/t/kb5127648-windows-11-cumulative-update-build-26100-9711-24h2-26200-9711-25h2-26300-9711-26h2-oct-13.50115/ Microsoft Support: This cumulative update for Windows 11, versions 26H2, 25H2, and 24H2 (KB5124010), includes production-quality improvements...
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 Microsoft Support:

This out-of-band (OOB) update for Windows 11, version 25H2 and Windows 11, version 24H2 (KB5129195) is cumulative. It includes updates from previous releases, along with additional security and non-security improvements. Visit the Windows release health dashboard for the latest status on this release.

Change log

Change date​
Change description​
September 18, 2026Added a known issue, "Domain-joined devices might lose their secure trust relationship with the domain".

Improvements​

This OOB update includes the following improvement:
  • [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​

Symptoms

After installing the August 2026 Windows non-security preview update KB5120998 and subsequent updates, some devices might experience desktop loading issues. This issue has been primarily observed on Azure Virtual Desktop (AVD) hosts using FSLogix. This issue appears to occur more frequently with some existing user profiles.

Affected users might see a black screen after sign-in, with the desktop session failing to load automatically. In some cases, users might be unable to access their desktop until the desktop session is started manually. Application event logs might also show Windows Explorer crashes.

Resolution

This issue is resolved in Windows updates released on and after October 13, 2026 such as KB5127648. We recommend you install the latest Windows update for your device as it contains important improvements and issue resolutions, including this one.

Symptoms

After installing the September 8, 2026, Windows security update (KB5124008), or later updates, some Credential Guard protected machine accounts might lose their secure channel with an on-premises Active Directory (AD) domain. Users might then be unable to sign in interactively with valid domain credentials and might receive a message stating that the trust relationship between the device and the domain failed. Offline sign-in using previously cached credentials might continue to work. AD replication and AD services on the domain controllers are not affected.

This issue occurs because KB5124008 and later updates enable the Machine Identity Isolation feature. While the update does not directly enable Machine Identity Isolation enforcement, it does cause Windows to begin honoring any existing or policy-provisioned settings that enabled Machine Identity Isolation enforcement. However, this feature is only supported for environments connected to domain controllers running at a Windows Server 2025 Domain Functional Level (DFL) and above. The feature should be disabled elsewhere. Any devices previously configured to use Machine Identity Isolation that are not connected to Windows Server 2025 domain controllers will experience this issue and will need to disable the feature.

Resolution

This issue is addressed by KB5124010. This update prevents Machine Identity Isolation (MII) enforcement by disabling it completely while improvements are made to the feature. MII enforcement will be prevented regardless of the MII configuration.

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.

Symptoms

After installing the September 2026 Windows security update KB5124008, some customers using File History, might be unable to create or update backups. File History, available through Control Panel > System and Security > File History, is used to back up files to an external drive or network location. Affected devices might incorrectly display a "Reconnect your drive" message even when a compatible backup drive is connected and functioning properly. Additionally, the "Last Backup" timestamp might not update, and previously backed up files might show "No previous version available." In some cases, Event Viewer might record application crash events referencing FileHistory.exe and KERNELBASE.dll.

Resolution

This issue is resolved in Windows updates released on and after September 22, 2026 such as KB5124010. We recommend you install the latest Windows update for your device as it contains important improvements and issue resolutions, including this one.

How to get this update​

Before you install this update

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

Available​
Next Step​
Available
This update downloads and installs automatically from Windows Update and Microsoft Update.
Available
To install this update, download the standalone package(s) for this update from the Microsoft Update Catalog. This update contains MSU files that require installation in a specific order. Follow the Arm64 installation instructions or x64 installation instructions, as appropriate.

If you install additional Dynamic Update packages, use versions from the same release month as this update. If a Safe OS Dynamic Update or Setup Dynamic Update is not available for the same release month, use the most recently released version.

Note This latest cumulative update includes updates for AI components. AI components are applicable only to Copilot+ PCs and will not install on other Windows client PCs or Windows Server.

File Information

For a list of the files provided in this update, download the file information for cumulative update KB5129195.

For a list of the files provided in the servicing stack update, download the file information for SSU KB5124007 - versions 22621.9441.


 Source:

September 14, 2026—KB5129195 (OS Builds 26200.9457 and 26100.9457) Out-of-band | Microsoft Support

September 14, 2026—KB5129195 (OS Builds 26200.9457 and 26100.9457) Out-of-band
support.microsoft.com support.microsoft.com


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ISO from Microsoft MCT:

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Last edited:
Click to expand...
File History is just a poor excuse for real backup.
 

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fg2001gf11F said:
@garlin,
I tried to use your script on a USB drive bigger than 32GB because it has faster r/w speeds, but I end up with a message saying "Drive E: is READ-ONLY" even if it is not. Any explanation?
Click to expand...
The original idea was to check if your drive letter was actually a Removable device (as reported by Windows). You obviously can't write the updated boot.wim back to a read-only device (actual DVD or an ISO file mounted as a drive letter).

I removed that check in this version.
 

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gunrunnerjohn said:
File History is just a poor excuse for real backup.
Click to expand...
I think the point is if File History isn't officially dead, why break it with this summer's updates?

According to the one person on Tech Community, File History was probably broken in the July Preview/August Monthly. But nobody started checking until now. I wouldn't blame the September update, it's more likely the August build.
 

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HTA said:
Hasn't File History in the process of being phased out?
Click to expand...
I've read that Microsoft now considers it a legacy feature and is removing it from the Settings app and relegating it back to the legacy Control Panel. Also, while it remains available on traditional x86/x64 PCs via the Control Panel, it was excluded from ARM64 builds which explains why it is completely absent on my Surface Laptop 7.
 

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garlin said:
I think the point is if File History isn't officially dead, why break it with this summer's updates?

According to the one person on Tech Community, File History was probably broken in the July Preview/August Monthly. But nobody started checking until now. I wouldn't blame the September update, it's more likely the August build.
Click to expand...
Well, I can't really argue with that. However, it's quite possible they didn't actually intend to break it, but since it stopped working, it's a low priority to get it running again. I know that I, for one, would rather they fix the stuff that isn't being depreciated first! 😊
 

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    Manufacturer/Model
    Home Brew
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    Intel Core i5 14500, 14th Generation
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    Gigabyte B760M G P WIFI
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garlin said:
The original idea was to check if your drive letter was actually a Removable device (as reported by Windows). You obviously can't write the updated boot.wim back to a read-only device (actual DVD or an ISO file mounted as a drive letter).

I removed that check in this version.
Click to expand...
@garlin,
I think this updated the boot.wim in the USB drive but still left the message to copy Updated_Boot.wim to the USB drive. 🤷‍♂️

1789592373348.webp
 

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Memory
64GB
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NVIDIA High Definition Audio
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Screen Resolution
3840 x 2160
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Thanks. I commented out that section for you.

When I wrote this script as a half-joke I didn't think it would be broken for this long. Maybe like 1-2 builds and then nobody would need it any more...

Let's see if tomorrow's AMA means someone will forward the news back to Windows team. The fix is right there in the posted comments; so they don't really have any excuses, and throwing in the extra DLL's won't cause any bad side effects.
 

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garlin said:
Thanks. I commented out that section for you.

When I wrote this script as a half-joke I didn't think it would be broken for this long. Maybe like 1-2 builds and then nobody would need it any more...

Let's see if tomorrow's AMA means someone will forward the news back to Windows team. The fix is right there in the posted comments; so they don't really have any excuses, and throwing in the extra DLL's won't cause any bad side effects.
Click to expand...
This is what I see about removable. Is there another place to check?
1789593224442.webp
 

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The script reads what PowerShell returns for "Get-Volume -DriveLetter X", and if it includes "Removable".

Based on feedback from the Secure Boot scripts, some drives don't report this correctly (or at least when formatted a certain way). The script just takes the reported result on face value, and doesn't try other methods to confirm if the drive's Removable or not.
 

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TheVisitor said:
As usual I'm lost or behind somewhere - what is this for and does everyone need to run this ?
Click to expand...

It automatically installed on my computer and I have Get the latest updates as soon as they're available possible turned off.
 

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garlin said:
The script reads what PowerShell returns for "Get-Volume -DriveLetter X", and if it includes "Removable".

Based on feedback from the Secure Boot scripts, some drives don't report this correctly (or at least when formatted a certain way). The script just takes the reported result on face value, and doesn't try other methods to confirm if the drive's Removable or not.
Click to expand...
@garlin,
Thanks for the clarification, that command returns Fixed DriveType, which in this case I think it should say Removable. 😵‍💫🤷‍♂️
I don't know why it shows fixed? It is a USB connected drive in a SABRENT enclosure. 🤷‍♂️

This explanation below is from A.I.
Your SABRENT enclosure shows a drive as a Fixed Disk rather than a Removable Disk because of how the enclosure’s internal SATA/NVMe-to-USB bridge controller (such as ASMedia or Realtek chips) passes along hardware identifiers to your operating system. [1, 2]

1789594263193.webp


1789595534143.webp


Anyway, here what I got with your latest script update. And "Repair my PC" works fine.

1789594136398.webp
 
Last edited:

My Computer My Computer

At a glance

Windows 11 Pro 25H2Intel I9-9900K64GBNVIDIA RTX 2060
OS
Windows 11 Pro 25H2
Computer type
PC/Desktop
Manufacturer/Model
Dell XPS 8930
CPU
Intel I9-9900K
Memory
64GB
Graphics Card(s)
NVIDIA RTX 2060
Sound Card
NVIDIA High Definition Audio
Monitor(s) Displays
4k Samsung
Screen Resolution
3840 x 2160
Hard Drives
512GB NVMe, ADATA SU 800, 2TB HDD
You missed the endless pages of fun on "what's a 'Removable' drive?" :crys:

To a non-technical user, this answer should be obvious. A removable drive is either a CD/DVD, or a portable USB thumb drive. But any ISO image mounted under a drive letter is "Removable". What we discovered in the Secure Boot scripts thread was several users had USB drives that reported themselves as "Fixed" devices.

Blame Windows or PS... After 4 different attempts at a workaround, we settled on a mostly OK method for determining that you have what a normal user thinks is a removable device. But that would make the Repair My BootWIM script more complicated than it needs to be.
 

My Computer My Computer

At a glance

Windows 7
OS
Windows 7
nayro said:
Hi everyone,

I installed the update and experienced a few issues right after, although everything seems fine now. I’m still a bit concerned and curious if others had similar problems.

Here’s what happened:

  • During boot, before the MSI motherboard logo appears, I got a black screen with a small white line in the top-left corner (like a terminal cursor). It lasted longer than usual.
  • On the login screen, I had a long freeze when entering my PIN. Also, instead of the usual rotating Windows background, my personal desktop wallpaper was displayed.
  • My wireless Logitech headset was no longer recognized (USB dongle). Even after several reboots, it didn’t work. I fixed it by plugging the USB receiver into a different port.
Everything is working normally now, but the behavior right after the update was a bit worrying.

Has anyone experienced something similar with this update?
Click to expand...

I did. I had problems with both a Logitech MX Keys S keyboard and Logitech Trackball MS Ergo S, both using a single LogiBold USB receiver. Needed much consternatory exclamations while attempting to resolve, multiple removals of the USB receiver as well as plugging into different ports and system reboots. I have no idea what actually fixed it, but fortunately didn't deplete consternatory reserves.
 

My Computers My Computers

System One System Two Other systems

  • At a glance

    Win11, 64-bit update 25H212th Gen Intel(R) Core(TM) i7-12700H (2.30 GHz)32 GB
    OS
    Win11, 64-bit update 25H2
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo P1 Gen5 ThinkPad Model 21DC004JUS
    CPU
    12th Gen Intel(R) Core(TM) i7-12700H (2.30 GHz)
    Motherboard
    BIOS N3JET46W (1.30 )
    Memory
    32 GB
    Screen Resolution
    2560x1600
    Hard Drives
    WD Black, 4TB

  • At a glance

    Win 11 Pro 25H2 Build 26200.8037Intel® Core™ Ultra 7 366H vPro® Processor64GBNVIDIA RTX PRO™ 2000 Blackwell Laptop GPU 8GB...
    Operating System
    Win 11 Pro 25H2 Build 26200.8037
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo P1 Gen9
    CPU
    Intel® Core™ Ultra 7 366H vPro® Processor
    Memory
    64GB
    Graphics card(s)
    NVIDIA RTX PRO™ 2000 Blackwell Laptop GPU 8GB GDDR7
    Screen Resolution
    16" WQUXGA (3840 x 2400), IPS, Anti-Glare, Non-Touch, HDR 400
    Hard Drives
    2 TB SSD M.2 2280 PCIe Gen5 Performance TLC Opal
    Other Info
    Intel® Wi-Fi 7 BE211 2x2 BE vPro® & Bluetooth® 5.4
  • Custom built Puget Systems desktop
More of this, on Public Build. 😵‍💫🤷‍♂️

1789601220329.webp
 

My Computer My Computer

At a glance

Windows 11 Pro 25H2Intel I9-9900K64GBNVIDIA RTX 2060
OS
Windows 11 Pro 25H2
Computer type
PC/Desktop
Manufacturer/Model
Dell XPS 8930
CPU
Intel I9-9900K
Memory
64GB
Graphics Card(s)
NVIDIA RTX 2060
Sound Card
NVIDIA High Definition Audio
Monitor(s) Displays
4k Samsung
Screen Resolution
3840 x 2160
Hard Drives
512GB NVMe, ADATA SU 800, 2TB HDD
garlin said:
As an emergency fix, MS is only concerned about Remote Desktop, Hyper-V, and broken audio support.
Click to expand...
We don't use RD or Hyper-V, and audio works fine for us on 26200.9445

No zero days, so no compelling reason for us to install it at this time.
 

My Computer My Computer

At a glance

Windows 11 Pro 26H2
OS
Windows 11 Pro 26H2
Computer type
Laptop
Manufacturer/Model
Toshiba
Antivirus
Defender
garlin said:
You missed the endless pages of fun on "what's a 'Removable' drive?" :crys:

To a non-technical user, this answer should be obvious. A removable drive is either a CD/DVD, or a portable USB thumb drive. But any ISO image mounted under a drive letter is "Removable". What we discovered in the Secure Boot scripts thread was several users had USB drives that reported themselves as "Fixed" devices.

Blame Windows or PS... After 4 different attempts at a workaround, we settled on a mostly OK method for determining that you have what a normal user thinks is a removable device. But that would make the Repair My BootWIM script more complicated than it needs to be.
Click to expand...
@garlin,

I added this to my post #112.

This explanation below is from A.I.
Your SABRENT enclosure shows a drive as a Fixed Disk rather than a Removable Disk because of how the enclosure’s internal SATA/NVMe-to-USB bridge controller (such as ASMedia or Realtek chips) passes along hardware identifiers to your operating system. [1, 2]
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
And more on Sabrent:

Understanding Drive Status in Windows
  • Fixed vs. Removable: Windows treats USB-connected storage controllers based on how the bridge chip (such as JMicron, ASMedia, or Realtek inside the Sabrent enclosure/dock) reports its device flags to the operating system.
  • Custom Firmware: Manufacturers like Sabrent rarely release custom firmware to change the fixed/removable flag because it can affect TRIM support, write-caching behavior, and Windows' handling of the filesystem.
  • Alternative Workarounds: If you need Windows to treat a fixed external drive as removable (for instance, to bypass caching or allow easier ejection of specific partitions), it is usually managed via Windows Device Manager under the drive's Policies tab ("Quick removal" vs. "Better performance") rather than a device firmware flash.

 
Last edited:

My Computer My Computer

At a glance

Windows 11 Pro 25H2Intel I9-9900K64GBNVIDIA RTX 2060
OS
Windows 11 Pro 25H2
Computer type
PC/Desktop
Manufacturer/Model
Dell XPS 8930
CPU
Intel I9-9900K
Memory
64GB
Graphics Card(s)
NVIDIA RTX 2060
Sound Card
NVIDIA High Definition Audio
Monitor(s) Displays
4k Samsung
Screen Resolution
3840 x 2160
Hard Drives
512GB NVMe, ADATA SU 800, 2TB HDD

My Computer My Computer

At a glance

Windows 11 ProCore i7-13700K64 GB Kingston Fury Beast DDR5Gigabyte GeForce RTX 2060 Super Gaming OC 8G
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Self build
CPU
Core i7-13700K
Motherboard
Asus TUF Gaming Plus WiFi Z790
Memory
64 GB Kingston Fury Beast DDR5
Graphics Card(s)
Gigabyte GeForce RTX 2060 Super Gaming OC 8G
Sound Card
Realtek S1200A
Monitor(s) Displays
Viewsonic VP2770 & Dell (secondary)
Screen Resolution
2560 x 1440
Hard Drives
Kingston KC3000 2TB NVME SSD & SATA HDDs & SSD
PSU
EVGA SuperNova G2 850W
Case
Nanoxia Deep Silence 1
Cooling
Noctua NH-D14
Keyboard
Microsoft Digital Media Pro
Mouse
Logitech Wireless
Internet Speed
80 Mb / s
Browser
Chrome
Antivirus
Defender, Malwarebytes Free & AdwCleaner
Every 5 days a Macrium and Hasleo-backup is enough for me .............! 🛠️
These backups saved my ass many times , especially after a bad update................:wink:
 

My Computers My Computers

System One System Two

  • At a glance

    Windows11 Pro 26H2i732GBnVidia
    OS
    Windows11 Pro 26H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Asus
    CPU
    i7
    Motherboard
    z97k
    Memory
    32GB
    Graphics Card(s)
    nVidia
    Sound Card
    Realtek
    Hard Drives
    3
    Cooling
    air
    Browser
    Edge
    Antivirus
    ESET

  • At a glance

    Windows11 ProIntel i516GBIntel
    Operating System
    Windows11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS
    CPU
    Intel i5
    Motherboard
    ASUS Basic
    Memory
    16GB
    Graphics card(s)
    Intel
    Sound Card
    Realtek
    Monitor(s) Displays
    Samsung
    Hard Drives
    one intern , 0ne extern, OS on SSD
    Cooling
    air
    Keyboard
    wireless Logitech
    Mouse
    wireless Logitech
    Internet Speed
    1GB
    Browser
    Edge
    Antivirus
    ESET
File History was never designed to be a full backup but made it easy to restore a file if needed and it was integrated into File Explorer
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11 26H2Intel i9 14900KF64GB Corsair Vengeance RGBMSI 4090 Suprim X
    OS
    Windows 11 26H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom Built
    CPU
    Intel i9 14900KF
    Motherboard
    ASUS Z790 ProArt Creator WiFi
    Memory
    64GB Corsair Vengeance RGB
    Graphics Card(s)
    MSI 4090 Suprim X
    Sound Card
    Onboard
    Monitor(s) Displays
    1 x Asus 24". 1 x Asus 32"
    Screen Resolution
    1920 x 1080 & 2560 x 1440 (4K DSR)
    Hard Drives
    Multiple
    PSU
    Corsair HX1200
    Case
    Corsair 7000D RGB
    Cooling
    Corsair H150I Capellix XT
    Keyboard
    Corsair K70 RGB PRO
    Mouse
    Corsair M55 RGB Pro
    Internet Speed
    1000Mbps
    Browser
    Edge
    Antivirus
    Windows Default

  • At a glance

    Windows 11 26H2Intel i9 11900K32GB DDR4 (Corsair)ASUS GTX 1080ti
    Operating System
    Windows 11 26H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom Built
    CPU
    Intel i9 11900K
    Motherboard
    ASUS ROG Strix Z590-E Gaming
    Memory
    32GB DDR4 (Corsair)
    Graphics card(s)
    ASUS GTX 1080ti
    Sound Card
    Onboard
    Monitor(s) Displays
    1x Viewsonic 24" 1x Samsung 17"
    Screen Resolution
    1920 x 1080 & 1366 x 768
    Hard Drives
    3 x SATA SSD
    PSU
    Corsair HX850W
    Case
    Fractel
    Cooling
    Noctua NH-D14
    Keyboard
    Generic RGB
    Mouse
    Microsoft Basic
    Internet Speed
    1000Mbps
    Browser
    Edge
    Antivirus
    Windows Default
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