CVE-2022-28736

Name	CVE-2022-28736
Description	There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grub2 (PTS)	bullseye (security), bullseye	2.06-3~deb11u6	fixed
	bookworm, bookworm (security)	2.06-13+deb12u1	fixed
	forky, trixie	2.12-9	fixed
	sid	2.14~git20250718.0e36779-2	fixed

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

Package	Type	Release	Fixed Version
grub2	source	buster	2.06-3~deb10u1
grub2	source	bullseye	2.06-3~deb11u1
grub2	source	(unstable)	2.06-3

Notes

[stretch] - grub2 <ignored> (No SecureBoot support in stretch)
[jessie] - grub2 <ignored> (No SecureBoot support in jessie)
https://www.openwall.com/lists/oss-security/2022/06/07/5