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Ubuntu 16.10 USN-3170-1 Critical Kernel: DoS Security Fix

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Multiple vulnerabilities have been resolved in the Ubuntu Linux kernel, encompassing solutions for severe risks and enhancements.
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)

Topics%20covered

Topics Covered

security advisory security issue DoS kernel fix kernel system update ubuntu

Update Instructions

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

Ubuntu 16.10:
  linux-image-4.8.0-34-generic    4.8.0-34.36
  linux-image-4.8.0-34-generic-lpae  4.8.0-34.36
  linux-image-4.8.0-34-lowlatency  4.8.0-34.36
  linux-image-4.8.0-34-powerpc-e500mc  4.8.0-34.36
  linux-image-4.8.0-34-powerpc-smp  4.8.0-34.36
  linux-image-4.8.0-34-powerpc64-emb  4.8.0-34.36
  linux-image-generic             4.8.0.34.43
  linux-image-generic-lpae        4.8.0.34.43
  linux-image-lowlatency          4.8.0.34.43
  linux-image-powerpc-e500mc      4.8.0.34.43
  linux-image-powerpc-smp         4.8.0.34.43
  linux-image-powerpc64-emb       4.8.0.34.43

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-3170-1

CVE-2016-9756, CVE-2016-9793

Severity
critical
Lowest
Low
Medium
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory security issue DoS kernel fix kernel system update ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/4.8.0-34.36

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