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====== Ubuntu - Vulnerabilities - Dirty COW ======

Dirty COW is an underlying issue was a race condition in the way kernel handles copy-on-write (COW).

More information can be found on [[https://security-tracker.debian.org/tracker/CVE-2016-5195|CVE-2016-5195]].

----

===== Check Vulnerability =====

To find out if your server is affected, check your kernel version.

<code bash>
uname -rv
</code>

You'll see output like this:

Output

<code>
4.4.0-42-generic #62-Ubuntu SMP Fri Oct 7 23:11:45 UTC 2016
</code>

If your version is earlier than the following, you are affected:

  * 4.8.0-26.28 for Ubuntu 16.10
  * 4.4.0-45.66 for Ubuntu 16.04 LTS
  * 3.13.0-100.147 for Ubuntu 14.04 LTS
  * 3.2.0-113.155 for Ubuntu 12.04 LTS
  * 3.16.36-1+deb8u2 for Debian 8
  * 3.2.82-1 for Debian 7
  * 4.7.8-1 for Debian unstable

----

===== Fix Vulnerability =====

<code bash>
sudo apt-get update && sudo apt-get dist-upgrade
</code>


<WRAP info>
On Redhat use:

sudo yum update kernel
</code>


Then reboot.