The beginning of 2018, several vulnerabilities in most used CPUs were revealed . Taking advantage of certain processor performance optimizations, these vulnerabilities make it possible for hackers to force applications into showing the contents of system and application memory when manipulated correctly. These attacks work because the normal privileges checking behavior.
Should I do something
Patches to secure against Meltdown were released from most OS vendors. So it's best to be up to date with the software on your system. Be sure that you have the latest software updates.
Solution update your system
First of all you need to know what is your system:
lsb_release -a cat /etc/*release
the result would be :
then you need to check your kernel version
You should receive a result similar to the following:
The output can be interpreted with the following key:
4 – Kernel Version
14 – Major Revision
14 – Minor Revision
These are the distributions that have released kernel updates:
Ubuntu 17.10: kernel 4.13.0-25-generic Ubuntu 16.04: kernel 4.4.0-109-generic Ubuntu 14.04: kernel 3.13.0-139-generic
If your kernel is updated to at least the version corresponding to the above, so you have some protection.
Otherwise you need to update your system by:
sudo apt-get update sudo apt-get dist-upgrade
Note: Please be sure to copy and back up valuable information before updates (in general).
Once you apply the updates you will need to reboot your machine.