USN-3220-2: Linux kernel (Xenial HWE) vulnerability

Ubuntu Security Notice USN-3220-2

7th March, 2017

linux-lts-xenial vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

• Ubuntu 14.04 LTS

Summary

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

Software description

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

Details

USN-3220-1 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.

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.

Update instructions

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

Ubuntu 14.04 LTS:

To update your system, please follow these instructions: