LUKS doesn't protect you from an evil maid attack. It hides your data when your stuff gets stolen in a powered off state, but it provides neither verification of data, nor does it provide verified/secure/safe boot.
In simple terms: the very first thing which gets loaded needs to be unencrypted (barring some exceptions I will omit here), which can get replaced with an evil version by the evil maid.
Is it even possible to mitigate such an issue? Will resetting the bios by removing the cmos battery not also disable password protection in the bios thus making it possible to disable secure boot?
And at that point could they not just use a hardware keylogger or something?
Yes, with a TPM. A TPM (2.0) can seal secrets and only release it when a machine fulfills certain configuration and state requirements (saved into registers called PCRs).
For example: make the decryption key one part dependant on a passphrase you memorized (to not only rely on a TPM), and one part on something saved in a TPM. If you select the correct PCRs when saving the latter, and your TPM works as advertised (and doesn't offer an easy way to eavesdrop/fool it), removing the battery would make the TPM not release the secret (if removing the battery even still works on modern machines).
However, this depends on having a unified kernel image, having configured dm-verity and maybe more stuff I don't recall right now. Probably should also make sure you don't allow Microsoft's Secure Boot keys and instead only your own. I hope this will get easier in the future, but I know SystemD is actively developing useful tools for that (e.g. ukify).
That all doesn't mean the critique of TPMs (intransparent, proprietary) is invalid. Maybe we'll have OpenTitan based TPMs at some point?
Well, yeah, luks + sb with custom keys + auto-lock when a usb gets ejected or smth is preferable
Man I didn't know evil made attacks were so easy to spot!
Hint: :q!
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