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Ubuntu 16.04 LTS USN-3128-1 Critical: Kernel Buffer Overflow Crash Risk

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Calendar Grey November 11, 2016
Scroller Ubuntu
Ubuntu USN-4135-1 details a critical vulnerability in the Linux kernel allowing for potential privilege escalation due to incorrect input validation.
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

Details:

Ondrej Kozina discovered that the keyring interface in the Linux kernel

contained a buffer overflow when displaying timeout events via the

/proc/keys interface. A local attacker could use this to cause a denial of

service (system crash).

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel ubuntu

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-47-generic    4.4.0-47.68
  linux-image-4.4.0-47-generic-lpae  4.4.0-47.68
  linux-image-4.4.0-47-lowlatency  4.4.0-47.68
  linux-image-4.4.0-47-powerpc-e500mc  4.4.0-47.68
  linux-image-4.4.0-47-powerpc-smp  4.4.0-47.68
  linux-image-4.4.0-47-powerpc64-emb  4.4.0-47.68
  linux-image-4.4.0-47-powerpc64-smp  4.4.0-47.68
  linux-image-generic             4.4.0.47.50
  linux-image-generic-lpae        4.4.0.47.50
  linux-image-lowlatency          4.4.0.47.50
  linux-image-powerpc-e500mc      4.4.0.47.50
  linux-image-powerpc-smp         4.4.0.47.50
  linux-image-powerpc64-emb       4.4.0.47.50
  linux-image-powerpc64-smp       4.4.0.47.50
  linux-image-virtual             4.4.0.47.50

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-3128-1

CVE-2016-7042

Severity
critical
Lowest
Low
Medium
High
Critical

November 11, 2016

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-47.68

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