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Ubuntu 16.04 LTS: USN-3221-2 Critical Linux HWE Kernel Crash Risk

ubuntu
Calendar Grey March 8, 2017
Dist Ubuntu Esm H88
USN-3221-3 discloses a severe vulnerability in the Linux HWE kernel that could trigger significant instability or unauthorized admin privileges.
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 for Ubuntu 16.04 LTS

Details:

USN-3221-1 fixed vulnerabilities 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.

Alexander Popov discovered that the N_HDLC line discipline implementation

in the Linux kernel contained a double-free vulnerability. A local attacker

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

administrative privileges. (CVE-2017-2636)

Topics%20covered

Topics Covered

security advisory critical ubuntu administrative access linux hwe

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.8.0-41-generic    4.8.0-41.44~16.04.1
  linux-image-4.8.0-41-generic-lpae  4.8.0-41.44~16.04.1
  linux-image-4.8.0-41-lowlatency  4.8.0-41.44~16.04.1
  linux-image-4.8.0-41-powerpc-e500mc  4.8.0-41.44~16.04.1
  linux-image-4.8.0-41-powerpc-smp  4.8.0-41.44~16.04.1
  linux-image-4.8.0-41-powerpc64-emb  4.8.0-41.44~16.04.1
  linux-image-generic-hwe-16.04   4.8.0.41.12
  linux-image-generic-lpae-hwe-16.04  4.8.0.41.12
  linux-image-lowlatency-hwe-16.04  4.8.0.41.12

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-3221-2

https://ubuntu.com/security/notices/USN-3221-1

CVE-2017-2636

Severity
critical
Lowest
Low
Medium
High
Critical

March 08, 2017

Topics%20covered

Topics Covered

security advisory critical ubuntu administrative access linux hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe/4.8.0-41.44~16.04.1

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