More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2369303 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
This likely comes from here: https://github.com/ruby/ruby/blob/5df38256792b2823a3dc201c100d0bcccdc61688/gc/mmtk/Cargo.lock#L320-L328 But `mmtk` GC is not build ATM.