USN-3234-2: Linux kernel (Xenial HWE) vulnerabilities

Ubuntu Security Notice USN-3234-2

15th March, 2017

linux-lts-xenial vulnerabilities

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

• Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

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

Details

USN-3234-1 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.

Ralf Spenneberg discovered that the ext4 implementation in the Linux kernel
did not properly validate meta block groups. An attacker with physical
access could use this to specially craft an ext4 image that causes a denial
of service (system crash). ()

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:
,

CVE-2017-5551