{"id":27805,"date":"2025-11-26T21:43:21","date_gmt":"2025-11-26T21:43:21","guid":{"rendered":"http:\/\/localhost\/?p=27805"},"modified":"2025-11-26T21:43:21","modified_gmt":"2025-11-26T21:43:21","slug":"uefi-shell-accessible-in-aavmf-with-secure-boot-enabled-on-ubuntu","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=27805","title":{"rendered":"UEFI Shell accessible in AAVMF with Secure Boot enabled on Ubuntu_CVE-2025-2486"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;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. 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