USN-2620-1: Linux kernel vulnerability

23 May 2015

linux vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.04 LTS


The system could be made to crash under certain conditions.

Software Description

  • linux - Linux kernel


A flaw was discovered in the Linux kernel’s IPv4 networking when using TCP fast open to initiate a connection. An unprivileged local user could exploit this flaw to cause a denial of service (system crash).

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04 LTS
linux-image-3.13.0-53-generic - 3.13.0-53.89
linux-image-3.13.0-53-generic-lpae - 3.13.0-53.89
linux-image-3.13.0-53-lowlatency - 3.13.0-53.89
linux-image-3.13.0-53-powerpc-e500 - 3.13.0-53.89
linux-image-3.13.0-53-powerpc-e500mc - 3.13.0-53.89
linux-image-3.13.0-53-powerpc-smp - 3.13.0-53.89
linux-image-3.13.0-53-powerpc64-emb - 3.13.0-53.89
linux-image-3.13.0-53-powerpc64-smp - 3.13.0-53.89

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.