USN-3234-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3234-1

15th March, 2017

linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities

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

• Ubuntu 16.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

• linux
  - Linux kernel
  
  





• linux-aws
  - Linux kernel for Amazon Web Services (AWS) systems
  
  





• linux-gke
  - Linux kernel for Google Container Engine (GKE) systems
  
  





• linux-raspi2
  - Linux kernel for Raspberry Pi 2
  
  





• linux-snapdragon
  - Linux kernel for Snapdragon Processors
  
  

Details

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 16.04 LTS:

linux-image-powerpc-e500mc 4.4.0.67.72

linux-image-snapdragon 4.4.0.1051.44

linux-image-powerpc64-emb 4.4.0.67.72

linux-image-gke 4.4.0.1006.7

linux-image-generic 4.4.0.67.72

linux-image-aws 4.4.0.1009.11

linux-image-raspi2 4.4.0.1048.48

linux-image-powerpc-smp 4.4.0.67.72

linux-image-generic-lpae 4.4.0.67.72

linux-image-powerpc64-smp 4.4.0.67.72

linux-image-lowlatency 4.4.0.67.72

To update your system, please follow these instructions:
,

CVE-2017-5551