https://wccftech.com/kaspersky-say-windows-10-update-bug-kb4524244-isnt-its-fault/

Microsoft pulled back the February Patch Tuesday security update (KB4524244) released for Windows 10 that caused several issues for some of the users. The company said it's working with partners on an improved version of this particular update. It now appears that the update was supposed to fix a security vulnerability that was found in Kaspersky Rescue Disk - a tool to clean infected computers.

The vulnerability allowed attackers to run an untrusted UEFI image on a computer protected by Secure Boot technology. "This could be done by exploiting a custom UEFI loader used by Kaspersky Rescue Disk," Kaspersky noted. "Practical attack scenario required physical access to a computer."