In Pictures: Ubuntu 14.04: The good, the bad, the ...
The Linux 3.13 kernel update most notably has a change in Linux firewall security, as the iptables firewall has been updated to nftables, a firewalling methodology that’s backward-compatible with iptables via translation utilities. The translation utilities allow updates so that the new firewalling can be scripted. Nftables creates a virtualized kernel space where packets can be inspected in ways that permit more fine-tuned acceptance/rejection criteria. The kernel also has updated memory handling, and better multi-core CPU handling.
In Pictures: Ubuntu 14.04: The good, the bad, the Unity