[mnw21cam]

You don't need a whole x32 userland in order to be exploited. Just a single x32 binary executable that happens to not depend on on any external libraries.

[spendergrsec]

You don't even need that. This can be done within a 64bit process using the x32 syscall number for recvmmsg.

-Brad

[mnw21cam]

Ouch.

[ahomescu1]

I did't mean for an exploit, I just meant that you don't have any use for a x32 kernel on your system if you don't have x32 apps and libraries (unless you build a statically-linked x32 app).