Analyzing CVE-2025-2296 [Un-verified #kernel bypass #SecureBoot mechanism in direct boot mode]
https://www.kraxel.org/blog/2025/12/analyzing-cve-2025-2296/
Gerd Hoffmann aka kraxel writes: ""[…] So, if secure boot is enabled attempts to boot via 'EFI stub' will fail, the firmware rejects the binary due to the signature check failing. OVMF will fallback to the legacy 'EFI handover protocol' loader. The legacy loader does not do secure boot verification, which is the core of CVE-2025-2296. And this was essentially unfixable (in the firmware alone) because there simply is no valid secure boot signature due to the patching qemu is doing. Nevertheless there are some use cases which expect direct kernel boot with secure boot enabled to work. Catch 22. […]
Secure boot bypass sounds scary, but is it really? […] So, the actual impact is quite limited. […]""
#Linux #UEFI #QEMU