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Ubuntu Security Notice USN-3168-2

Ubuntu Security Notice USN-3168-2
Posted Jan 11, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3168-2 - USN-3168-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS. Dmitry Vyukov discovered that the KVM implementation in the Linux kernel did not properly initialize the Code Segment in certain error cases. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2016-9756, CVE-2016-9793, CVE-2016-9794, CVE-2016-9806
SHA-256 | 9012cf3de066704f3448524d520c803cb2d915bc3249eb551d28620e06df1168

Ubuntu Security Notice USN-3168-2

Change Mirror Download

==========================================================================
Ubuntu Security Notice USN-3168-2
January 11, 2017

linux-lts-trusty 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-lts-trusty: Linux hardware enablement kernel from Trusty for Precise

Details:

USN-3168-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 LTS.

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). (CVE-2016-9756)

Andrey Konovalov discovered that signed integer overflows existed in the
setsockopt() system call when handling the SO_SNDBUFFORCE and
SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability
could use this to cause a denial of service (system crash or memory
corruption). (CVE-2016-9793)

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)

Baozeng Ding discovered a double free in the netlink_dump() function in the
Linux kernel. A local attacker could use this to cause a denial of service
(system crash). (CVE-2016-9806)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.13.0-107-generic 3.13.0-107.154~precise1
linux-image-3.13.0-107-generic-lpae 3.13.0-107.154~precise1
linux-image-generic-lpae-lts-trusty 3.13.0.107.98
linux-image-generic-lts-trusty 3.13.0.107.98

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-3168-2
http://www.ubuntu.com/usn/usn-3168-1
CVE-2016-9756, CVE-2016-9793, CVE-2016-9794, CVE-2016-9806

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-107.154~precise1


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