1. Ubuntu Security Notices
  2. USN-3763-1

USN-3763-1: Linux kernel vulnerability

Publication date

11 September 2018

Overview

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

Releases

Packages

Details

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.

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

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
12.04 precise linux-image-3.2.0-135-virtual –  3.2.0-135.181
linux-image-3.2.0-135-highbank –  3.2.0-135.181
linux-image-3.2.0-135-generic-pae –  3.2.0-135.181
linux-image-powerpc-smp –  3.2.0.135.150
linux-image-generic –  3.2.0.135.150
linux-image-3.2.0-135-omap –  3.2.0-135.181
linux-image-3.2.0-135-generic –  3.2.0-135.181
linux-image-generic-pae –  3.2.0.135.150
linux-image-highbank –  3.2.0.135.150
linux-image-3.2.0-135-powerpc64-smp –  3.2.0-135.181
linux-image-powerpc64-smp –  3.2.0.135.150
linux-image-3.2.0-135-powerpc-smp –  3.2.0-135.181
linux-image-omap –  3.2.0.135.150
linux-image-virtual –  3.2.0.135.150

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›