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That's incorrect. The Parrot module has only 32MB RAM and is running a custom marvell buildroot-style linux distribution [1].
You're confusing the linux running on the information center, with the linux running on the Parrot board.
[1] https://fccid.io/RKXFC6050W/Users-Manual/user-manual-1707044
The kernel version of the information center is irrelevant.
The Wi-Fi stack is running on a separate module (the Parrot module, as mentioned in the article), which runs its own obsolete linux version.
I'm sure they're using a stable branch and keeping up with security patches
Surely you must be joking... The last kernel 2.6.x LTS version to be maintained is 2.6.32.71, and its maintenance ended in March 2016 [1].
No Security patches were released for 2.6.x since then.
[1] https://en.wikipedia.org/wiki/Linux_kernel_version_history#R...