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Ubuntu 16.10 USN-3266-1 Critical: Linux Kernel Denial Of Service

ubuntu
Calendar Grey April 25, 2017
Dist Ubuntu Esm H88
Explore the resolution for Ubuntu's USN-3266-1, which addresses a particular kernel vulnerability that could lead to system failures in certain scenarios.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux: Linux kernel

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

Alexander Popov discovered that a race condition existed in the Stream

Control Transmission Protocol (SCTP) implementation in the Linux kernel. A

local attacker could use this to cause a denial of service (system crash).

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system crash Linux kernel

Update Instructions

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

Ubuntu 16.10:
  linux-image-4.8.0-1035-raspi2   4.8.0-1035.38
  linux-image-4.8.0-49-generic    4.8.0-49.52
  linux-image-4.8.0-49-generic-lpae  4.8.0-49.52
  linux-image-4.8.0-49-lowlatency  4.8.0-49.52
  linux-image-4.8.0-49-powerpc-e500mc  4.8.0-49.52
  linux-image-4.8.0-49-powerpc-smp  4.8.0-49.52
  linux-image-generic             4.8.0.49.61
  linux-image-generic-lpae        4.8.0.49.61
  linux-image-lowlatency          4.8.0.49.61
  linux-image-powerpc-e500mc      4.8.0.49.61
  linux-image-powerpc-smp         4.8.0.49.61
  linux-image-raspi2              4.8.0.1035.39

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-3266-1

CVE-2017-5986

Severity
critical
Lowest
Low
Medium
High
Critical

April 25, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system crash Linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux/4.8.0-49.52
https://launchpad.net/ubuntu/+source/linux-raspi2/4.8.0-1035.38

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