Please provide more detailed information to reproduce it.
How do you get the memory usage?
What is the network setup (i assume your EVK is really connected to network)?
Which kernel config do you use (mxs_defconfig)?
How long does it take to reach the 25 MB?
Did you try to enable CONFIG_DEBUG_KMEMLEAK in kernel?
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YES, the device is connected to network via switch.
The memory usage increases from 17M to 26M at about 30 minutes.
I use tx28_defconfig for TX28 KaRo CoM
I don't enable this option.