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Critical vulnerability affecting most Linux distros allows for bootkits
(arstechnica.com)
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this post was submitted on 07 Feb 2024
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This is a vulnerability in shim, which is a UEFI "bootloader" used by distros mainly to allow booting with the "stock" (Microsoft) secure boot keys.
If you don't use secure boot or don't use shim (likely if you use your own keys), this doesn't affect you at all.
In any case this "critical vulnerability" mainly affects machines relying on shim which also boot over unencrypted HTTP.
Would this affect systems booting to the refind bootloader without secure boot? Sorry for the ignorance just trying to figure out if I should be changing my system for this news.
No
No.
This is a vulnerability which allows bypassing secure boot protections. You have already manually bypassed those protections by disabling secure boot.