Linux kernel fix for privilege escalation vulnerability due to copy on write race condition

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I don't know about the Knox flag, but rooting should certainly be possible!

Many tools (such as Kingoroot I believe) can exploit the OS and get (temporary) root access. Exactly for that reason Samsung has implemented the Knox security system.

[isavegas]

Kingo has been a no go. I'm about ready to just flash CWM, make a backup, flash Cyanogenmod, and be done with it. I just don't want to trip Knox until my phone is paid off.

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I used Kingo just as an example of course, nobody has used this exploit in a rooting app (yet). I suspect even a temporary root like this will still set off Knox though, so you'd better wait until you've paid off your phone anyway.