Home / mailings [USN-3167-1] Linux kernel vulnerabilities
Posted on 11 January 2017
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Ubuntu Security Notice USN-3167-1
January 11, 2017
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux: Linux kernel
Details:
Dmitry Vyukov discovered that the KVM implementation in the Linux
kernel did not properly initialize the Code Segment (CS) in certain
error cases. A local attacker could use this to expose sensitive
information (kernel memory).
Baozeng Ding discovered a race condition that could lead to a use-after-
free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux
kernel. A local attacker could use this to cause a denial of service
(system crash). (CVE-2016-9794)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 LTS:
linux-image-3.2.0-120-generic 3.2.0-120.163
linux-image-3.2.0-120-generic-pae 3.2.0-120.163
linux-image-3.2.0-120-highbank 3.2.0-120.163
linux-image-3.2.0-120-omap 3.2.0-120.163
linux-image-3.2.0-120-powerpc-smp 3.2.0-120.163
linux-image-3.2.0-120-powerpc64-smp 3.2.0-120.163
linux-image-3.2.0-120-virtual 3.2.0-120.163
linux-image-generic 3.2.0.120.135
linux-image-generic-pae 3.2.0.120.135
linux-image-highbank 3.2.0.120.135
linux-image-omap 3.2.0.120.135
linux-image-powerpc-smp 3.2.0.120.135
linux-image-powerpc64-smp 3.2.0.120.135
linux-image-virtual 3.2.0.120.135
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:
http://www.ubuntu.com/usn/usn-3167-1
CVE-2016-9756, CVE-2016-9794
Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-120.163
