| Package | Affected versions | Patched versions |
|---|---|---|
| grub2 | < 2.12-1ubuntu5 | 2.12-1ubuntu5 |
GRUB2 does not call the module fini functions on exit, leading to Debian/Ubuntu's peimage GRUB2 module leaving UEFI system table hooks after exit. This lead to a use-after-free condition, and could possibly lead to secure boot bypass.
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