I don't know what they are currently doing, but historically Proxmox uses Debian as the OS base but with Ubuntu as the kernel source. So they rely on the Ubuntu security team backporting security patches for the kernel.
I wouldn’t expect it to be, as kernel.org don’t list distribution kernels.
(Ignore this if it’s irrelevant and I’m missing the point, which is always a distinct possibility)
> Many Linux distributions provide their own "longterm maintenance" kernels that may or may not be based on those maintained by kernel developers. These kernel releases are not hosted at kernel.org and kernel developers can provide no support for them.
> It is easy to tell if you are running a distribution kernel. Unless you downloaded, compiled and installed your own version of kernel from kernel.org, you are running a distribution kernel. To find out the version of your kernel, run uname -r:
kernel.org don't even list version 6.14 anymore. do they backport security patches on there own?