September 9, 2025—KB5065474: Hotpatch for Windows 11 Enterprise LTSC 2024 (OS Build 26100.6508)
Berlaku Untuk
Tanggal Rilis:
09/09/2025
Versi:
OS Build 26100.6508
Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
To learn more about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows 11, version 24H2.
Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release Health Dashboard.
Improvements and fixes
The security update includes quality improvements. The following summary outlines key issues addressed by this update.
-
[App compatibility (known issue)] Fixed: Addresses an issue that caused non-admin users to receive unexpected User Account Control (UAC) prompts when MSI installers perform certain custom actions. These actions might include configuration or repair operations in the foreground or background, during the initial installation of an application.
This issue could prevent non-admin users from running apps that perform MSI repairs, including Office Professional Plus 2010 and multiple applications from Autodesk (including AutoCAD). This fix reduces the scope for requiring UAC prompts for MSI repairs and enables IT admins to disable UAC prompts for specific apps by adding them to an allowlist. For more information, see Unexpected UAC prompts when running MSI repair operations after installing the August 2025 Windows security update.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
Known issues in this update
Symptoms We are aware of an edge case affecting hotpatched devices that have installed the September 2025 Hotpatch update (KB5065474) or the September 2025 security update (KB5065426). These devices might experience failures with PowerShell Direct (PSDirect) connections when the host and guest virtual machines (VMs) are both not fully updated. When a patched guest VM attempts to connect to an unpatched host (or vice versa), the system is expected to fall back to a legacy handshake and clean up the socket gracefully. However, this fallback mechanism fails intermittently, resulting in socket cleanup issues. The connection failure might appear random, and users might observe Event ID 4625 logged in the Security Event log within Windows Event Viewer.
Workaround
This issue is addressed in KB5066360. If your hotpatched device is experiencing issues with PSDirect connection, we recommend updating both the host and guest VM with these updates.
How to get this update
Before you install this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the hotpatch update. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you are using Windows Update, the latest SSU installs with this update.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
|
Release Channels |
Available |
Next step |
|
Windows Update |
|
This update downloads and installs automatically from Windows update and Microsoft Update |
|
Catalog |
|
See the other options. |
|
Server Update Services |
|
See the other options. |
File information
For a list of the files provided in this update, download the file information for cumulative update 5065474.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5064531) - version 26100.5074.
Note: Hotpatch is now generally available for Windows 11, version 24H2 (Arm64) devices. To get started, check the prerequisites, disable Compiled Hybrid PE (CHPE), and enroll the devices in a quality update policy with Hotpatch enabled. For more information, see prerequisites.
Improvements and fixes
The security update includes quality improvements. The following summary outlines key issues addressed by this update.
-
[App compatibility (known issue)] Fixed: Addresses an issue that caused non-admin users to receive unexpected User Account Control (UAC) prompts when MSI installers perform certain custom actions. These actions might include configuration or repair operations in the foreground or background, during the initial installation of an application.
This issue could prevent non-admin users from running apps that perform MSI repairs, including Office Professional Plus 2010 and multiple applications from Autodesk (including AutoCAD). This fix reduces the scope for requiring UAC prompts for MSI repairs and enables IT admins to disable UAC prompts for specific apps by adding them to an allowlist. For more information, see Unexpected UAC prompts when running MSI repair operations after installing the August 2025 Windows security update.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
Known issues in this update
Symptoms We are aware of an edge case affecting hotpatched devices that have installed the September 2025 Hotpatch update (KB5065474) or the September 2025 security update (KB5065426). These devices might experience failures with PowerShell Direct (PSDirect) connections when the host and guest virtual machines (VMs) are both not fully updated. When a patched guest VM attempts to connect to an unpatched host (or vice versa), the system is expected to fall back to a legacy handshake and clean up the socket gracefully. However, this fallback mechanism fails intermittently, resulting in socket cleanup issues. The connection failure might appear random, and users might observe Event ID 4625 logged in the Security Event log within Windows Event Viewer.
Workaround
This issue is addressed in KB5066360. If your hotpatched device is experiencing issues with PSDirect connection, we recommend updating both the host and guest VM with these updates.
How to get this update
Before you install this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the hotpatch update. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you are using Windows Update, the latest SSU installs with this update.
To use Hotpatch updates, your device must meet the following requirements:
-
Windows 11 Enterprise, version 24H2 (Build 26100.4929 or later), with the current baseline update installed.
-
Microsoft Intune with a Hotpatch-enabled Windows quality update policy (see “Enroll Arm64 devices to receive Hotpatch updates").
-
An eligible license: Windows 11 Enterprise E3 or E5, Microsoft 365 F3, Windows 11 Education A3 or A5, Microsoft 365 Business Premium, or Windows 365 Enterprise.
-
Virtualization-based security (VBS) enabled.
For more information, see Hotpatch prerequisites.
One-time setup: Disable CHPE to enable Hotpatch on Arm64
To enable hotpatching on Arm64 devices, you must also disable CHPE. CHPE is a compatibility layer that's not compatible with Hotpatch updates.
-
Use the DisableCHPE policy. Apply the following configuration service provider (CSP) setting via Microsoft Intune or Group Policy, then restart the device once. Learn more at System Policy CSP. ./Device/Vendor/MSFT/Policy/Config/Hotpatch/DisableCHPE = 1
-
Use registry keys. You can also set the following registry key value to 1, then restart the device once. HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\HotPatchRestrictions = 1
Your Arm64 devices are now Hotpatch ready! For more information, see DisableCHPE.
Enroll Arm64 devices to receive Hotpatch updates
To enroll devices to receive Hotpatch updates:
-
Go to the Microsoft Intune admin center.
-
Navigate to Devices > Windows updates > Quality updates.
-
If you're creating a new policy, select Create Windows quality update policy. To edit an existing policy, select it from the list under Name. On the following screen, select Edit next to Settings.
-
Next to Automatic update deployment settings, ensure that the option “When available, apply without restarting the device” is set to Allow.
-
Assign the policy to your Arm64 device group.
See the full guide at Enroll devices to receive Hotpatch updates.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
|
Release Channels |
Available |
Next step |
|
Windows Update |
|
This update downloads and installs automatically from Windows update and Microsoft Update |
|
Catalog |
|
See the other options. |
|
Server Update Services |
|
See the other options. |
File information
For a list of the files provided in this update, download the file information for cumulative update 5065474.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5064531) - version 26100.5074.
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