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6.4
GRUB2 can bypass Secure Boot when started directly
published 4 days ago
Summary
The GRUB2 boot loader may skip checking the digital signature of the operating system kernel if it is launched without an intermediate shim. This can let an attacker load an unsigned or tampered kernel, defeating Secure Boot protection. Apply the latest GRUB2 updates or patches to ensure kernel signatures are always verified.
What to do
- Update cleanstart grub to version 2.06-r0.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | grub |
< 2.06-r0 Fix: upgrade to 2.06-r0
|
Original advisory text
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed
Security vulnerability affects the grub package. GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed.
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published31 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-XM31676 · OSV
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