Which is latest linux version?
So, Linux isn't an Operating System. Linux is the main piece of the Operating System. This being the case, the latest Linux main piece (called the kernel) is 3.17.2 (stable).
At the same time, there are many different distros, which are Operating Systems using Linux. Now there are too many distros to count, but the most popular Linux distro, Ubuntu, has the latest release set at 14.10 ‘Utopic Unicorn’
Hope this helps,