Stable backports of subsystems

Stable backports of subsystems

It is, but that's where Red Hat's commercial links come into play - what the vendor says is not "our app is certified with Linux 5.10", but "our app is certified when running on Red Hat Enterprise Linux 8.1", and there's trust from the vendor that if Red Hat change anything in an RHEL 8.1 patch, Red Hat will fix things. Every so often, the vendor will rebase onto a newer RHEL; e.g. they may move from 8.1 to 8.7, even though 8.8 and 9.2 are current.

If you're unusually lucky, the vendor will certify their app for any minor release of a given major release of RHEL - e.g. "our app is certified when running on RHEL 7", and that usually implies that the vendor has a commercial relationship with Red Hat so that they get support if fixes in a minor release break their app.