USN-3251-1: Linux kernel vulnerability

29 March 2017

linux, linux-raspi2 vulnerability

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

  • Ubuntu 16.10

Summary

The system could be made to crash or run programs as an administrator.

Software Description

  • linux - Linux kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that the xfrm framework for transforming packets in the Linux kernel did not properly validate data received from user space. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code with administrative privileges.

Update instructions

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

Ubuntu 16.10
linux-image-4.8.0-1032-raspi2 - 4.8.0-1032.35
linux-image-4.8.0-45-generic - 4.8.0-45.48
linux-image-4.8.0-45-generic-lpae - 4.8.0-45.48
linux-image-4.8.0-45-lowlatency - 4.8.0-45.48
linux-image-4.8.0-45-powerpc-e500mc - 4.8.0-45.48
linux-image-4.8.0-45-powerpc-smp - 4.8.0-45.48
linux-image-generic - 4.8.0.45.57
linux-image-generic-lpae - 4.8.0.45.57
linux-image-lowlatency - 4.8.0.45.57
linux-image-powerpc-e500mc - 4.8.0.45.57
linux-image-powerpc-smp - 4.8.0.45.57
linux-image-raspi2 - 4.8.0.1032.36

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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.

References