GRUB: Multiple vulnerabilities — GLSA 202104-05

Multiple vulnerabilities have been found in GRUB, the worst might allow for circumvention of UEFI Secure Boot.

Affected packages

sys-devel/grub on all architectures
Affected versions < 2.06_rc1
Unaffected versions >= 2.06_rc1

Background

GNU GRUB is a multiboot boot loader used by most Linux systems.

Description

Multiple vulnerabilities have been discovered in GRUB. Please review the CVE identifiers referenced below for details.

Impact

Please review the referenced CVE identifiers for details.

Workaround

There is no known workaround at this time.

Resolution

All GRUB users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-devel/grub-2.06_rc1"
 

After upgrading, make sure to run the grub-install command with options appropriate for your system. See the GRUB Quick Start guide in the references below for examples. Your system will be vulnerable until this action is performed.

References

Release date
April 30, 2021

Latest revision
April 30, 2021: 1

Severity
normal

Exploitable
local

Bugzilla entries