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Ubuntu 14.04 LTS USN-3392-2 Critical: Kernel Regression Threat

ubuntu
Calendar Grey August 16, 2017
Dist Ubuntu Esm H88
Important upgrade for Ubuntu 14.04 LTS addresses issues in hardware enablement kernel, mitigating potential security vulnerabilities.
USN-3378-2 introduced a regression the Linux Hardware Enablement kernel.

Summary

USN-3378-2 introduced a regression the Linux Hardware Enablement

kernel.

Software Description:

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

Details:

USN-3392-1 fixed a regression 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.

USN-3378-2 fixed vulnerabilities in the Linux Hardware Enablement

kernel. Unfortunately, a regression was introduced that prevented

conntrack from working correctly in some situations. This update

fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Fan Wu and Shixiong Zhao discovered a race condition between inotify events

and vfs rename operations in the Linux kernel. An unprivileged local

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

execute arbitrary code. (CVE-2017-7533)

It was discovered that the Linu...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu kernel regression linux-lts-xenial

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-92-generic    4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-generic-lpae  4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-lowlatency  4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-powerpc-e500mc  4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-powerpc-smp  4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-powerpc64-emb  4.4.0-92.115~14.04.1
  linux-image-4.4.0-92-powerpc64-smp  4.4.0-92.115~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.92.76
  linux-image-generic-lts-xenial  4.4.0.92.76
  linux-image-lowlatency-lts-xenial  4.4.0.92.76
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.92.76
  linux-image-powerpc-smp-lts-xenial  4.4.0.92.76
  linux-image-powerpc64-emb-lts-xenial  4.4.0.92.76
  linux-image-powerpc64-smp-lts-xenial  4.4.0.92.76

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-3392-1

https://bugs.launchpad.net/linux/+bug/1709032, https://ubuntu.com/security/notices/USN-3378-2

Severity
critical
Lowest
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Medium
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Critical

August 16, 2017

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu kernel regression linux-lts-xenial

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-92.115~14.04.1

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