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“Something has gone seriously wrong,” dual-boot systems warn after Microsoft update
(arstechnica.com)
this post was submitted on 21 Aug 2024
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That's not the case. The update was only meant to go out to Windows users. But Microsoft messed up and accidentally released to all users, or at least some who weren't supposed to receive it. My guess is that Microsoft usually doesn't update secure boot stuff for dual boot users and instead waits for the distro to push the update.
The bottom line is that a windows update broke grub. Again.
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It's a vulnerability that affects secure boot through grub. MS is the interested party in patching it because they're the ones selling secure boot certifications. It doesn't surprise me a bit if the open source community is not interested in patching secure boot holes.