Ubuntu 16.04 LTS USN-3385-1 Critical: Kernel Denial Of Service

ubuntu

August 11, 2017

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux 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:

Andrey Konovalov discovered a race condition in the UDP Fragmentation

Offload (UFO) code in the Linux kernel. A local attacker could use this to

cause a denial of service or execute arbitrary code. (CVE-2017-1000112)

Andrey Konovalov discovered a race condition in AF_PACKET socket option

handling code in the Linux kernel. A local unprivileged attacker could use

this to cause a denial of service or possibly execute arbitrary code.

(CVE-2017-1000111)

Topics Covered

security advisory denial of service critical kernel ubuntu linux

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1026-gke      4.4.0-1026.26
  linux-image-4.4.0-1030-aws      4.4.0-1030.39
  linux-image-4.4.0-1069-raspi2   4.4.0-1069.77
  linux-image-4.4.0-1071-snapdragon  4.4.0-1071.76
  linux-image-4.4.0-91-generic    4.4.0-91.114
  linux-image-4.4.0-91-generic-lpae  4.4.0-91.114
  linux-image-4.4.0-91-lowlatency  4.4.0-91.114
  linux-image-4.4.0-91-powerpc-e500mc  4.4.0-91.114
  linux-image-4.4.0-91-powerpc-smp  4.4.0-91.114
  linux-image-4.4.0-91-powerpc64-emb  4.4.0-91.114
  linux-image-4.4.0-91-powerpc64-smp  4.4.0-91.114
  linux-image-aws                 4.4.0.1030.32
  linux-image-generic             4.4.0.91.96
  linux-image-generic-lpae        4.4.0.91.96
  linux-image-gke                 4.4.0.1026.27
  linux-image-lowlatency          4.4.0.91.96
  linux-image-powerpc-e500mc      4.4.0.91.96
  linux-image-powerpc-smp         4.4.0.91.96
  linux-image-powerpc64-emb       4.4.0.91.96
  linux-image-powerpc64-smp       4.4.0.91.96
  linux-image-raspi2              4.4.0.1069.69
  linux-image-snapdragon          4.4.0.1071.63

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.