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Ubuntu 16.10 USN-3221-1 Critical: Kernel Double-Free Denial of Service

ubuntu
Calendar Grey March 8, 2017
Dist Ubuntu Esm H88
Ubuntu USN-3221-2 resolves critical kernel vulnerabilities leading to possible system failures and unauthorized admin control.
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: Linux kernel

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

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.

Topics%20covered

Topics Covered

security advisory denial of service critical kernel update instructions ubuntu administrative access

Update Instructions

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

Ubuntu 16.10:
  linux-image-4.8.0-1028-raspi2   4.8.0-1028.31
  linux-image-4.8.0-41-generic    4.8.0-41.44
  linux-image-4.8.0-41-generic-lpae  4.8.0-41.44
  linux-image-4.8.0-41-lowlatency  4.8.0-41.44
  linux-image-4.8.0-41-powerpc-e500mc  4.8.0-41.44
  linux-image-4.8.0-41-powerpc-smp  4.8.0-41.44
  linux-image-4.8.0-41-powerpc64-emb  4.8.0-41.44
  linux-image-generic             4.8.0.41.52
  linux-image-generic-lpae        4.8.0.41.52
  linux-image-lowlatency          4.8.0.41.52
  linux-image-powerpc-e500mc      4.8.0.41.52
  linux-image-powerpc-smp         4.8.0.41.52
  linux-image-powerpc64-emb       4.8.0.41.52
  linux-image-raspi2              4.8.0.1028.31

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-3221-1

CVE-2017-2636

Severity
critical
Lowest
Low
Medium
High
Critical

March 08, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical kernel update instructions ubuntu administrative access

Package Information

https://launchpad.net/ubuntu/+source/linux/4.8.0-41.44
https://launchpad.net/ubuntu/+source/linux-raspi2/4.8.0-1028.31

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