Recent reports have emerged about the August 13 Windows 11 update breaking dual-boot configurations running Windows and Linux on the same computer. Many users have reported that the latest Windows updates are causing severe problems with their Linux installations, often preventing Linux from starting up altogether. The root of the problem lies in how these updates interact with the system that manages the computer's startup process, particularly affecting setups that use GRUB (GRand Unified Bootloader). With the installation of the new update with CVE-2022-2601 patches, Microsoft tried to fix Secure Boot Advanced Targeting (SBAT) settings to block vulnerable Linux bootloaders from loading. However, numerous users discovered they could no longer access their Linux operating systems after.

Once this update wrecks the dual-boot GRUB setup, it displays messages like "Verifying shim SBAT data failed: Security Policy Violation. Something has gone seriously wrong: SBAT self-check failed: Security Policy Violation." The updates may alter essential startup files, disrupting Linux's ability to load correctly. As a result, there are growing demands for Microsoft to quickly address and resolve this issue. The problem is particularly impactful for a set group of users, including software developers and gaming enthusiasts, who depend on having both operating systems available. Microsoft has recognized the existence of this problem and is reportedly developing a solution. In the meantime, it is good practice for users to back up their data and consider temporary alternatives, such as using virtual machines or separate computers for Linux, until a fix is available.