USN-3207-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3207-1

21st 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 version:

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

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

CVE-2016-7910, CVE-2016-7911, CVE-2017-6074