Ksplice is a software, which allows you to patch your kernel without restart and without that causing downtime. It is completely harmless operation. Ksplice was acquired by oracle and currently it is available only on Oracle Linux / Ubuntu and Red-hat :D

Ksplice can patch the kernel either by: Ksplice ID OR patch all the way.

# uptrack-show
Installed updates:
[guclwyc2] CVE-2012-0957: Information leak in uname syscall.
[j4d07e02] Kernel panic in IPv4 ARP and IPv6 Neighbor Discovery.
[r8og1ec4] CVE-2013-1979: Privilege escalation with UNIX socket credentials.
#

# uptrack-install guclwyc2 -y
The following steps will be taken:
Install [guclwyc2] CVE-2012-0957: Information leak in uname syscall.
Installing [guclwyc2] CVE-2012-0957: Information leak in uname syscall.
Your kernel is fully up to date.
#

# uptrack-upgrade -y
The following steps will be taken:
Install [guclwyc2] CVE-2012-0957: Information leak in uname syscall.
Install [j4d07e02] Kernel panic in IPv4 ARP and IPv6 Neighbor Discovery.
Install [r8og1ec4] CVE-2013-1979: Privilege escalation with UNIX socket credentials.
Install [fiq04xbb] CVE-2013-2237: Information leak on IPSec key socket.
Install [9q4luou3] CVE-2014-3687: Remote denial-of-service in SCTP stack.
Installing [guclwyc2] CVE-2012-0957: Information leak in uname syscall.
Installing [j4d07e02] Kernel panic in IPv4 ARP and IPv6 Neighbor Discovery.
Installing [r8og1ec4] CVE-2013-1979: Privilege escalation with UNIX socket credentials.
Installing [fiq04xbb] CVE-2013-2237: Information leak on IPSec key socket.
Installing [9q4luou3] CVE-2014-3687: Remote denial-of-service in SCTP stack.
Your kernel is fully up to date.
Effective kernel version is 2.6.39-400.215.13.el6uek
#

# uptrack-show --available
Available updates:
[fiq04xbb] CVE-2013-2237: Information leak on IPSec key socket.
[9q4luou3] CVE-2014-3687: Remote denial-of-service in SCTP stack.
#