Windows 11, version 22H2 known issues and notifications
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Known issues
| Summary | Originating update | Status | Last updated |
|---|---|---|---|
| August 2024 security update might impact Linux boot in dual-boot setup devices This issue might impact devices with dual-boot setup for Windows and Linux when SBAT setting is applied | OS Build 22621.4037 KB5041585 2024-08-13 | Mitigated | 2024-08-23 15:09 PT |
Issue details
August 2024
August 2024 security update might impact Linux boot in dual-boot setup devices
| Status | Originating update | History |
|---|---|---|
| Mitigated | OS Build 22621.4037 KB5041585 2024-08-13 | Last updated: 2024-08-23, 15:09 PT Opened: 2024-08-21, 18:33 PT |
After installing the August 2024 Windows security update, released August 13, 2024 (KB5041585), you might face issues with booting Linux if you have enabled the dual-boot setup for Windows and Linux in your device. Resulting from this issue, your device might fail to boot Linux and show the error message “Verifying shim SBAT data failed: Security Policy Violation. Something has gone seriously wrong: SBAT self-check failed: Security Policy Violation.”
The August 2024 Windows security update applies a Secure Boot Advanced Targeting (SBAT) setting to devices that run Windows to block old, vulnerable boot managers. This SBAT update will not be applied to devices where dual booting is detected. On some devices, the dual-boot detection did not detect some customized methods of dual-booting and applied the SBAT value when it should not have been applied.
Workaround:
Scenario 1: Before applying the August 2024 Windows update
If you’re dual booting Linux and Windows and you haven’t finalized the installation of the August 2024 Windows update with a reboot yet, you will be able to use the below opt-out registry key. This registry prevents the SBAT update from being applied as part of the August 2024 Windows update and future Windows updates, preventing this issue from happening. Later on, you will be able to delete the registry key if you want to install future SBAT updates.
Important: This documentation contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, see How to back up and restore the registry in Windows.
reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecureBoot\SBAT /v OptOut /d 1 /t REG_DWORD
Scenario 2: After applying the August 2024 Windows update
If your Linux becomes unbootable after installing the August 13, 2024, or later updates, you can recover your Linux system by following these instructions.
Important: Modifying firmware settings incorrectly might prevent your device from starting correctly. Follow these instructions carefully and only proceed if you are confident in your ability to do so.
- Boot into your device’s firmware settings.
- Disable Secure Boot (steps vary by manufacturer).
- Boot into Linux.
- Open the terminal and run the below command:
sudo mokutil --set-sbat-policy delete
- Enter your root password if prompted.
- Boot into Linux once more.
- In the terminal, run the below command:
mokutil --list-sbat-revocations
- Ensure the list shows no revocations.
- Reboot into the firmware settings.
- Re-enable Secure Boot.
- Boot into Linux. Run the below command:
mokutil --sb-state
- The output should be “SecureBoot enabled”. If not, retry the step 4.
- Boot into Windows.
- Open Command Prompt as Administrator and run:
reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecureBoot\SBAT /v OptOut /d 1 /t REG_DWORD
At this point, you should now be able to boot into Linux or Windows as before. It’s a good time to install any pending Linux updates to ensure your system is secure.
Next steps: We are investigating the issue with our Linux partners and will provide an update when more information is available.
Affected platforms:
- Client: Windows 11, version 23H2; Windows 11, version 22H2; Windows 11, version 21H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise 2015 LTSB
- Server: Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012
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