New mainline kernels, such as 5.10, are released every few months. When the mainline kernel is released for general use, it is considered "stable." Bug fixes for a stable kernel are back-ported from the mainline tree and applied by a designated stable kernel maintainer.
Which kernel version is the best?
The 3 best Android kernels, and why you would want one
- Franco Kernel. This is one of the biggest kernel projects on the scene, and is compatible with quite a few devices, including the Nexus 5, the OnePlus One and more. ...
- ElementalX. ...
- Linaro Kernel.
Is kernel 5.9 stable?
The good thing is that it is a long term stable release and will be supported for some years. You can use your distribution's package manager to install the newer kernel.