The 5.5-rc6 kernel prepatch is out for
testing. “Let’s see how things go. I do suspect that this ends up
being one of those ‘rc8’ releases, not because things look particularly bad
right now, but simply because the holiday season has meant that both the
testing side and the development side have been quiet. But who
knows?”

On the stable side,
5.4.11,
4.19.95,
4.14.164,
4.9.209, and
4.4.209
have all been released with another set of important fixes.

Source: LWN.net – 5.5-rc6 and stable kernels too