The Canonical Livepatch Service is Available to all Ubuntu Advantage customers, and also for personal use for free up to a maximum of three Ubuntu 16.04 LTS and 14.04 LTS systems. It updates your Ubuntu your systems with the highest and most critical security vulnerabilities, without requiring a reboot in order to take effect.
The Livepatch service is available for the generic flavour of the 64-bit Intel/AMD (aka, x86_64, amd64) builds of the Ubuntu 16.04 LTS (Xenial) kernel, which is a Linux 4.4 kernel, as well as Ubuntu 14.04 LTS running the Linux 4.4 Hardware Enablement kernel. It works with unmodified Ubuntu kernels on Ubuntu 16.04 LTS and 14.04 LTS Servers and Desktops, on physical machines, virtual machines, and in the cloud. As mentioned before, Ubuntu 14.04 LTS systems must use the Hardware Enablement kernel. Additionally, network access to the Canonical Livepatch Service (https://livepatch.canonical.com:443) and the latest version of snapd (at least 2.15) are needed.
How to get security notices for Livepatch
When a Livepatch is released, it is announced as a Kernel Live Patch Security Notice (LSN) in the Ubuntu Security Announcements mailing list. If a high/critical Kernel CVE is not able to be livepatched, a LSN notice will still go out to describing why. A normal Ubuntu security notice (USN) will be released with packages along side it. Subscribe to the mailing list to get USN and LSN notifications.
What kinds of updates will be provided by the Canonical Livepatch Service?
The Livepatch Service intends to address high and critical severity Linux kernel security vulnerabilities, as identified by Ubuntu Security Notices and the CVE tracker. Since there are limitations to the kernel livepatch technology, some Linux kernel code paths cannot be safely patched while running. There may be occasions when the traditional kernel upgrade and reboot might still be necessary.