description: 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.
affected:
{
packageName: grub2
product: Debian based GNU GRUB
vendor: Debian
repo: https://git.savannah.gnu.org/cgit/grub.git
platforms: Linux
versions:
lessThan: 2.12-1ubuntu5, status: affected, version: 0, versionType: semver
}
metrics:
format: CVSS
cvssV3_1: [
version: 3.1
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: HIGH
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
vectorString: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
baseScore: 6.7
baseSeverity: MEDIUM
]