CVE-2021-3697

Name	CVE-2021-3697
Description	A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
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)

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~deb11u1	fixed
	bullseye (security)	2.06-3~deb11u4	fixed
	bookworm	2.06-5	fixed
	sid	2.06-7	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