September 10, 2024—KB5043050 (OS Build 17763.6293) - EXPIRED

Highlights

• This update addresses security issues for your Windows operating system. 

Improvements

This security update includes improvements. Below is a summary of the key issues that this update addresses when you install this KB. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are documenting.

• [AppContainer] Printers do not work as you expect when you use them in a restricted setting, like AppContainer.

• [BitLocker] You might not be able to decrypt a BitLocker data drive. This occurs when you move that drive from a newer version of Windows to an older version.

• ​​​​​​​[Windows Installer] When it repairs an application, the User Account Control (UAC) does not prompt for your credentials. After you install this update, the UAC will prompt for them. Because of this, you must update your automation scripts. Application owners must add the Shield icon. It indicates that the process requires full administrator access. To turn off the UAC prompt, set the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer\DisableLUAInRepair registry value to 1. The changes in this update might affect automatic Windows Installer repairs; see Application Resiliency: Unlock the Hidden Features of Windows Installer.​​​​​​​​​​​​​​

• [Windows Server 2019 (known issue)] Some devices slow down, stop responding, and have high CPU usage. This is most likely to occur with Cryptographic Services. A few companies report that the issue occurs when antivirus software scans the %systemroot%\system32\catroot2 folder for Windows updates.

• [Dual boot of Windows and Linux (known issue)] Linux might fail to start up when you turn on dual-boot setup for Windows and Linux on your device. The error message is, “Verifying shim SBAT data failed: Security Policy Violation. Something has gone seriously wrong: SBAT self-check failed: Security Policy Violation.” See the full guidance in CVE-2022-2601 and CVE-2023-40547.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the September 2024 Security Updates.

Known issues in this update

How to get this update

EXPIRATION NOTICE 

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows. ​​​​​​​