Segfaults are just the simplest way of exposing a memory issue. It's quite easy to use a race condition to reproduce a state that isn't supposed to be reachable, and that's much worse than a segfault, because it means memory corruption.

Now the big question, as you mention, is "can it be exploited?" My assumption is that it can, but that there are much lower-hanging fruits. But it's just an assumption, and I don't even know how to check it.