> I find that's still catastrophic given how centralized cloud environments are.

It's not like every cloud environment is vulnerable. GCP drops these options for example.

> If Ubuntu disagrees, they should have said something and not pasted "Cvss 3 Severity Score 9.8 · Critical" at the top of the page.

Again I'm going not going to argue they did a good job at pointing at their rationale but it looks like 9.8 is from CVSS 3.0 and they did prioritization with 4.0 which is 8.3. They definitely should have put that up front.