Patch Propagation

[MF Ghani]

Hi,
What is the current workflow of the patch propagation from linux mainline
to ubuntu kernel versions? are the downstream ubuntu kernels rebased
against the latest mainline kernel version? or are they just rebased
against the mainline kernel version from which a particular ubuntu version
was initially forked from. e.g is ubuntu 18.04 (bionic) rebased against the
minor releases of 4.15.x only or are they rebased against the latest
mainline version lets say 5.0.

Also, are the latest patches from linux mainline propagated to ubuntu LTS
versions that are still being supported. if so, what's the process?
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