USN-3763-1: Linux kernel vulnerability

11 September 2018

linux vulnerability

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

  • Ubuntu 12.04 ESM


The system could be made to crash if it received specially crafted network traffic.

Software Description

  • linux - Linux kernel


Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service.

Update instructions

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

Ubuntu 12.04 ESM
linux-image-3.2.0-135-generic - 3.2.0-135.181
linux-image-3.2.0-135-generic-pae - 3.2.0-135.181
linux-image-3.2.0-135-highbank - 3.2.0-135.181
linux-image-3.2.0-135-omap - 3.2.0-135.181
linux-image-3.2.0-135-powerpc-smp - 3.2.0-135.181
linux-image-3.2.0-135-powerpc64-smp - 3.2.0-135.181
linux-image-3.2.0-135-virtual - 3.2.0-135.181
linux-image-generic -
linux-image-generic-pae -
linux-image-highbank -
linux-image-omap -
linux-image-powerpc-smp -
linux-image-powerpc64-smp -
linux-image-virtual -

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.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.