[Q] CM9 on stock kernel?

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http://forum.xda-developers.com – Realy sorry for my noob question, I have a locked bootloader I was researching a bit about the ICS for xperia x8, seeing that only custom roms based on AVD run on stock kernel, because the AVD is based on the same kernel version. But, isn't possible to adapt the CM9 to run on stock kernel? Why the CM9 don't have support for X8 on Cyanogenmod website? How developers made Roms based on it? Moreover, why all the custom kernels are based on version It is impossible or unnecessary to create a custom kernel based on 2.6.32 or up? Sorry for my bad English. (HowTos)