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Ubuntu 14.04 LTS: USN-3128-2 Critical: Buffer Overflow Causes Crash

ubuntu
Calendar Grey November 11, 2016
Scroller Ubuntu
A recent patch for Ubuntu 14.04 LTS resolves a critical kernel failure caused by a buffer overflow, which affects overall system reliability.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

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

Details:

USN-3128-1 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.

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 buffer overflow system stability ubuntu linux linux update kernel crash

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-47-generic    4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-generic-lpae  4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-lowlatency  4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-powerpc-e500mc  4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-powerpc-smp  4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-powerpc64-emb  4.4.0-47.68~14.04.1
  linux-image-4.4.0-47-powerpc64-smp  4.4.0-47.68~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.47.34
  linux-image-generic-lts-xenial  4.4.0.47.34
  linux-image-lowlatency-lts-xenial  4.4.0.47.34
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.47.34
  linux-image-powerpc-smp-lts-xenial  4.4.0.47.34
  linux-image-powerpc64-emb-lts-xenial  4.4.0.47.34
  linux-image-powerpc64-smp-lts-xenial  4.4.0.47.34

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-3128-2

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 buffer overflow system stability ubuntu linux linux update kernel crash

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-47.68~14.04.1

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