BootHole: GRUB UEFI Secure Boot vulnerability.

In case you’ve not been reading the news, a vulnerability has been found in GRUB:

https://eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
https://www.kb.cert.org/vuls/id/174059
https://www.kb.cert.org/vuls/id/174059
https://ubuntu.com/security/notices/USN-4432-1
https://cyber.gc.ca/en/alerts/grub-security-advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader
https://access.redhat.com/errata/RHSA-2020:3217

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