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Yes I had considered it rather apparent I was referring to the page at the virtual address zero, but I've definitely referred to the CoW page used for private anonymous mappings as the "zero page" too, so I understand the confusion. I probably should have made it more clear! Sorry about that.

Yes, you have that right. By mapping memory to the page at index zero (the page a 'null' pointer would point to), an attacker can leverage a null dereference to achieve much more interesting/dangerous outcomes than just a crash.

I don't know any context where "the zero page" means "the page with all zeros in it". It's a rather commonly used term.

Google linux zero page.

The results about the page at address zero and the results about the page of all zeros are about equally common.

The page full of zeros is used constantly when processes allocate memory, and is set to copy-on-write.

Yep, that is common OS speak.