USN-3052-1: Linux kernel vulnerabilities

10 August 2016

linux vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

It was discovered that the keyring implementation in the Linux kernel did not ensure a data structure was initialized before referencing it after an error condition occurred. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-4470)

Kangjie Lu discovered an information leak in the netlink implementation of the Linux kernel. A local attacker could use this to obtain sensitive information from kernel memory. (CVE-2016-5243)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.13.0-93-generic - 3.13.0-93.140
linux-image-3.13.0-93-generic-lpae - 3.13.0-93.140
linux-image-3.13.0-93-lowlatency - 3.13.0-93.140
linux-image-3.13.0-93-powerpc-e500 - 3.13.0-93.140
linux-image-3.13.0-93-powerpc-e500mc - 3.13.0-93.140
linux-image-3.13.0-93-powerpc-smp - 3.13.0-93.140
linux-image-3.13.0-93-powerpc64-emb - 3.13.0-93.140
linux-image-3.13.0-93-powerpc64-smp - 3.13.0-93.140

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