Hello, native English speakers,
does the sentence sound natural?
Several members of the committee have hearing disabilities.
Or should I say
Several members of the committee have a hearing disability.
If you want to see a variety of other similar examples, and advice on how to handle such cases, do a web search for "subject-complement agreement".
In this specific case, though, as @mdchachi has pointed out, both sound OK, so you can freely use either one.
English doesn't have a strict rule in such cases, but when in doubt, following subject-complement agreement is a fairly safe choice. In this case, that would result in choosing the first sentence, to match the plural.