CVE-2020-25632

Name	CVE-2020-25632
Description	A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DSA-4867-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grub2 (PTS)	buster	2.06-3~deb10u1	fixed
	buster (security)	2.06-3~deb10u3	fixed
	bullseye	2.06-3~deb11u5	fixed
	bullseye (security)	2.06-3~deb11u4	fixed
	bookworm, sid	2.06-13	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grub2	source	buster	2.02+dfsg1-20+deb10u4		DSA-4867-1
grub2	source	(unstable)	2.04-16

[stretch] - grub2 <ignored> (No SecureBoot support in stretch)