CVE-2025-54770

Name	CVE-2025-54770
Description	A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability
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)
Debian Bugs	1120968

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	vulnerable
	bookworm, bookworm (security)	2.06-13+deb12u1	vulnerable
	trixie	2.12-9	vulnerable
	forky	2.14~git20250718.0e36779-2	vulnerable
	sid	2.14-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grub2	source	(unstable)	2.14-1			1120968

Notes

[trixie] - grub2 <no-dsa> (Minor issue)
[bookworm] - grub2 <no-dsa> (Minor issue)
https://gitweb.git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=10e58a14db20e17d1b6a39abe38df01fef98e29d (grub-2.14)