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Ubuntu 16.04 LTS: USN-3251-2 Critical: Kernel DoS Threat

ubuntu
Calendar Grey March 30, 2017
Dist Ubuntu Esm H88
Important security patch for Ubuntu 16.04 targets a kernel vulnerability that might allow malicious actors to destabilize the system or run unauthorized code.
The system could be made to crash or run programs as an administrator.

Summary

The system could be made to crash or run programs as an administrator.

Software Description:

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3251-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS.

It was discovered that the xfrm framework for transforming packets in the

Linux kernel did not properly validate data received from user space. A

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

or execute arbitrary code with administrative privileges.

Topics%20covered

Topics Covered

security advisory doS kernel ubuntu administrative access hwe

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.8.0-45-generic    4.8.0-45.48~16.04.1
  linux-image-4.8.0-45-generic-lpae  4.8.0-45.48~16.04.1
  linux-image-4.8.0-45-lowlatency  4.8.0-45.48~16.04.1
  linux-image-generic-hwe-16.04   4.8.0.45.17
  linux-image-generic-lpae-hwe-16.04  4.8.0.45.17
  linux-image-lowlatency-hwe-16.04  4.8.0.45.17

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-3251-2

https://ubuntu.com/security/notices/USN-3251-1

CVE-2017-7184

Severity
critical
Lowest
Low
Medium
High
Critical

March 30, 2017

Topics%20covered

Topics Covered

security advisory doS kernel ubuntu administrative access hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe/4.8.0-45.48~16.04.1

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