Oh dear
I know 9 is essentially in beta-ish and this is just a learning box, nothing in production but doesn't inspire confidence
(base) [paulj@e-uxxmcasspj5 ~]$ cat /etc/redhat-release
CentOS Stream release 9
(base) [paulj@e-uxxmcasspj5 ~]$ ./cve-2021-4034--2022-01-25-0936.sh
This script (v1.0) is primarily designed to detect CVE-2021-4034 on supported
Red Hat Enterprise Linux systems and kernel packages.
Result may be inaccurate for other RPM based systems.
This script is meant to be used only on RHEL 6-8.