9 Months Later, Microsoft Finally Fixes Linux Dual-Booting Bug

Last August a Microsoft security update broke dual-booting Windows 11 and Linux systems, remembers the blog Neowin. Distros like Debian, Ubuntu, Linux Mint, Zorin OS, and Puppy Linux were all affected, and 'a couple of days later, Microsoft provided a slightly lengthy workaround that involved tweaking around with policies and the Registry in order to fix the problem.'

The update 'was meant to address a GRUB bootloader vulnerability that allowed malicious actors to bypass Secure Boot's safety mechanisms,' notes the It's FOSS blog. 'Luckily, there's now a proper fix for this, as Microsoft has quietly released a new patch on May 13, 2025, addressing the issue nine months after it was first reported... Meanwhile, many dual-boot users were left with borked setups, having to use workarounds or disable Secure Boot altogether.'

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