On the development side, Linus has released 5.3-rc6 for testing. “I’m doing a (free) operating system (more than just a hobby) for 486
AT clones and a lot of other hardware. This has been brewing for the
last 28 years, and is still not done. I’d like any feedback on any
bugs introduced this release (or older bugs too, for that matter).”

For those wanting something more stable,
5.2.10,
4.19.68,
4.14.140,
4.9.190, and
4.4.190
have all been released.

Source: LWN.net – Prepatch and stable kernels