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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Ubuntu | edk2 | 2024.05 – < 2024.05-2ubuntu0.3, 2024.02 – < 2024.02-2ubuntu0.3 | 2024.05-2ubuntu0.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | edk2 | 2023.11-7 | — |
| Debian 13 | edk2 | 2023.11-7 | — |
| Debian 12 | edk2 | 2022.11-6+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | edk2 | 2024.02-2ubuntu0.3 | — |