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.
This Cyber News was published on www.tenable.com. Publication date: Sat, 06 Apr 2024 22:56:04 +0000