Update Linux Kernel on a Codespace

[A-Mozeak]

Problem

I'd like to use codespaces to work on a project that requires newer features of the Linux kernel (specifically the accept() syscall for io_uring). Even though I am using the Ubuntu devcontainer, this does not update the codespace's kernel to 5.11. I'm assuming that the host machine for Codespaces is using the 5.4.0 kernel.
Here's the output of uname -sr:

Linux 5.4.0-1070-azure

Question

Is there any way to update the kernel to a newer version on the host Codespace machine?

[ItzLevvie]

Is there any way to update the kernel to a newer version on the host Codespace machine?

It is not updatable because the kernel updates to the host images are controlled by GitHub themselves.

GitHub Codespaces is now on Linux 6.8.0-1021-azure (2025) since a few weeks ago which is an upgrade from Linux 6.5.0-1025-azure (2024).