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Patches issued to fix a recent BootHole vulnerability have rendered RedHat and CentOS systems unbootable.

 

Early this morning, an urgent bug showed up at Red Hat's bugzilla bug tracker—a user discovered that the RHSA_2020:3216 grub2 security update and RHSA-2020:3218 kernel security update rendered an RHEL 8.2 system unbootable. The bug was reported as reproducible on any clean minimal install of Red Hat Enterprise Linux 8.2.

The patches were intended to close a newly discovered vulnerability in the GRUB2 boot manager called BootHole. The vulnerability itself left a method for system attackers to potentially install "bootkit" malware on a Linux system despite that system being protected with UEFI Secure Boot.