USN-3207-1: Linux kernel vulnerabilities

22 February 2017

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 a use-after-free vulnerability existed in the block device layer of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-7910)

Dmitry Vyukov discovered a use-after-free vulnerability in the sys_ioprio_get() function in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-7911)

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2017-6074)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.13.0-110-generic - 3.13.0-110.157
linux-image-3.13.0-110-generic-lpae - 3.13.0-110.157
linux-image-3.13.0-110-lowlatency - 3.13.0-110.157
linux-image-3.13.0-110-powerpc-e500 - 3.13.0-110.157
linux-image-3.13.0-110-powerpc-e500mc - 3.13.0-110.157
linux-image-3.13.0-110-powerpc-smp - 3.13.0-110.157
linux-image-3.13.0-110-powerpc64-emb - 3.13.0-110.157
linux-image-3.13.0-110-powerpc64-smp - 3.13.0-110.157
linux-image-generic - 3.13.0.110.118
linux-image-generic-lpae - 3.13.0.110.118
linux-image-highbank - 3.13.0.110.118
linux-image-lowlatency - 3.13.0.110.118
linux-image-powerpc-e500 - 3.13.0.110.118
linux-image-powerpc-e500mc - 3.13.0.110.118
linux-image-powerpc-smp - 3.13.0.110.118
linux-image-powerpc64-emb - 3.13.0.110.118
linux-image-powerpc64-smp - 3.13.0.110.118

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