KB5050021: list of drivers that are at risk for Bring Your Own Vulnerable Driver (BYOVD) attacks

January 14, 2025—KB5050021 (OS Builds 22621.4751 and 22631.4751)

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

Improvements
This security update includes improvements that were a part of update KB5048685 (released December 10, 2024). 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.

• [Windows Kernel Vulnerable Driver Blocklist file (DriverSiPolicy.p7b)] This update adds to the list of drivers that are at risk for Bring Your Own Vulnerable Driver (BYOVD) attacks.

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