If you're able to determine that the bug is present in the upstream Linux kernel, you may want to work directly with the upstream developers. Please note that there are separate processes for reporting a normal bug and a security bug.
Is there a missing feature that you'd like to see? Please request it on the WSL GitHub project.
If you're able and interested in contributing kernel code for your feature request, we encourage you to submit the change upstream.
Instructions for building an x86_64 WSL2 kernel with an Ubuntu distribution are as follows:
- Install the build dependencies:
$ sudo apt install build-essential flex bison dwarves libssl-dev libelf-dev
- Build the kernel using the WSL2 kernel configuration:
$ make KCONFIG_CONFIG=Microsoft/config-wsl
Please see the documentation on the .wslconfig configuration file for information on using a custom built kernel.