CVE-2025-2486

Name	CVE-2025-2486
Description	The Ubuntu edk2 UEFI firmware packages accidentally allowed the UEFI Shell to be accessed in Secure Boot environments, possibly allowing bypass of Secure Boot constraints. Versions 2024.05-2ubuntu0.3 and 2024.02-2ubuntu0.3 disable the Shell. Some previous versions inserted a secure-boot-based decision to continue running inside the Shell itself, which is believed to be sufficient to enforce Secure Boot restrictions. This is an additional repair on top of the incomplete fix for CVE-2023-48733.
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
edk2 (PTS)	bullseye	2020.11-2+deb11u2	fixed
	bullseye (security)	2020.11-2+deb11u3	fixed
	bookworm	2022.11-6+deb12u2	fixed
	bookworm (security)	2022.11-6+deb12u1	fixed
	trixie	2025.02-8	fixed
	forky	2025.02-9	fixed
	sid	2025.11-3	fixed

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

Package	Type	Release	Fixed Version
edk2	source	bullseye	2020.11-2+deb11u2
edk2	source	bookworm	2022.11-6+deb12u1
edk2	source	(unstable)	2023.11-7

Notes

https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2101797
To address CVE-2023-48733 in Debian a local patch disabled the built-in Shell
when SecureBoot is enabled fixing CVE-2025-2486.
Be cautious of possible regression when backporting patches to stable releases
https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2101797/comments/9