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Ubuntu 14.04 LTS USN-3169-2 Moderate: KVM Memory Exposure

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
A set of security updates was issued for the Linux kernel in Ubuntu on January 12, bolstering the system's security measures.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3169-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu

14.04 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-aft...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update system crash trusty linux-lts-xenial code segment

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-59-generic    4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-generic-lpae  4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-lowlatency  4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-powerpc-e500mc  4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-powerpc-smp  4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-powerpc64-emb  4.4.0-59.80~14.04.1
  linux-image-4.4.0-59-powerpc64-smp  4.4.0-59.80~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.59.46
  linux-image-generic-lts-xenial  4.4.0.59.46
  linux-image-lowlatency-lts-xenial  4.4.0.59.46
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.59.46
  linux-image-powerpc-smp-lts-xenial  4.4.0.59.46
  linux-image-powerpc64-emb-lts-xenial  4.4.0.59.46
  linux-image-powerpc64-smp-lts-xenial  4.4.0.59.46

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

https://ubuntu.com/security/notices/USN-3169-2

CVE-2016-9756, CVE-2016-9793, CVE-2016-9794

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service kernel update system crash trusty linux-lts-xenial code segment

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-59.80~14.04.1

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