CVE-2025-2486

UEFI Shell accessible in AAVMF with Secure Boot enabled on Ubuntu

State: Published
Severity: 3.7 Low
Published: Nov 26, 2025
Updated: Nov 26, 2025
Reserved: Mar 18, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	3.7 Low	CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:U	canonical

Weaknesses

CWE-489 Active Debug Code

Affected Products

Product	Versions
edk2Ubuntu	2024.05 to before 2024.05-2ubuntu0.3Affected 2024.02 to before 2024.02-2ubuntu0.3Affected

References

https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/2101797

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