Uname false output inside the contianer

I have a Dedian host

uname -a
Linux test-machine 3.14-0.bpo.2-amd64 #1 SMP Debian 3.14.15-2~bpo70+1 (2014-08-21) x86_64 GNU/Linux

I have pulled the official ubuntu image "ubuntu:14.04"
I am running and interactive bash shell using the above image and while executing again
uname -a inside the container the output is this
Linux 992d243b9cb8 3.14-0.bpo.2-amd64 #1 SMP Debian 3.14.15-2~bpo70+1 (2014-08-21) x86_64 x86_64 x86_64 GNU/Linux

Any thoughts about this?? Is this normal behavior??