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Ubuntu 16.04 LTS USN-3169-1 Critical Kernel Security Issues

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Several security patches released in Ubuntu Security Notice USN-3169-1 addressing kernel issues on January 11, 2017.
Several security issues were fixed in the kernel.

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). (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)

Topics%20covered

Topics Covered

security advisory denial of service critical kernel system update information exposure ubuntu

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-59-generic    4.4.0-59.80
  linux-image-4.4.0-59-generic-lpae  4.4.0-59.80
  linux-image-4.4.0-59-lowlatency  4.4.0-59.80
  linux-image-4.4.0-59-powerpc-e500mc  4.4.0-59.80
  linux-image-4.4.0-59-powerpc-smp  4.4.0-59.80
  linux-image-4.4.0-59-powerpc64-emb  4.4.0-59.80
  linux-image-4.4.0-59-powerpc64-smp  4.4.0-59.80
  linux-image-generic             4.4.0.59.62
  linux-image-generic-lpae        4.4.0.59.62
  linux-image-lowlatency          4.4.0.59.62
  linux-image-powerpc-e500mc      4.4.0.59.62
  linux-image-powerpc-smp         4.4.0.59.62
  linux-image-powerpc64-emb       4.4.0.59.62
  linux-image-powerpc64-smp       4.4.0.59.62

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

Severity
critical
Lowest
Low
Medium
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical kernel system update information exposure ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-59.80

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