I guess it is mostly a problem for RedHat: The RH kernel is nominally an old stable version, but with fixes and hardware support frankensteined on from the late

I guess it is mostly a problem for RedHat: The RH kernel is nominally an old stable version, but with fixes and hardware support frankensteined on from the later to latest kernel versions. If new kernel versions now start to expect features and behaviour of newer compiler versions, those backports become more difficult.