Long story short – the problem began after Microsoft’s August 2024 Patch updates, which included a mitigation for a known GRUB2 vulnerability (CVE-2022-2601). The flaw allowed malicious actors to bypass UEFI Secure Boot protections using a compromised GRUB2 bootloader.To address this, Microsoft deployed a Secure Boot Advanced Targeting (SBAT) update (KB5041571) to block vulnerable bootloaders. Unfortunately, this had unintended consequences.While it was supposed to detect and exempt dual-boot configurations from being affected, this detection failed in several scenarios. As a result, many dual-boot users with Windows and Linux on the same machine suddenly found themselves unable to get into their...