Well apparently even minix3 is not free from critical vulterabilities ;)
https://security-center.intel.com/advisory.aspx?intelid=INTE...
Intel's shitty apps running on Minix != Minix itself
https://security-center.intel.com/advisory.aspx?intelid=INTE...
It shouldn't be. It's ill suited for that.
Look at seL4, minix3, echronos instead.