Ubuntu 16.04 LTS USN-3312-1 Addresses Critical Denial Of Service Issue

ubuntu

June 7, 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:

It was discovered that the netfilter netlink implementation in the Linux

kernel did not properly validate batch messages. A local attacker with the

CAP_NET_ADMIN capability could use this to expose sensitive information or

cause a denial of service. (CVE-2016-7917)

Qian Zhang discovered a heap-based buffer overflow in the tipc_msg_build()

function in the Linux kernel. A local attacker could use to cause a denial

of service (system crash) or possibly execute arbitrary code with

administrative privileges. (CVE-2016-8632)

It was discovered that the keyring implementation in the Linux kernel in

some situations did no...

Read the Full Advisory

Topics Covered

security advisory denial of service critical Ubuntu kernel local attack

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1014-gke      4.4.0-1014.14
  linux-image-4.4.0-1018-aws      4.4.0-1018.27
  linux-image-4.4.0-1057-raspi2   4.4.0-1057.64
  linux-image-4.4.0-1059-snapdragon  4.4.0-1059.63
  linux-image-4.4.0-79-generic    4.4.0-79.100
  linux-image-4.4.0-79-generic-lpae  4.4.0-79.100
  linux-image-4.4.0-79-lowlatency  4.4.0-79.100
  linux-image-4.4.0-79-powerpc-e500mc  4.4.0-79.100
  linux-image-4.4.0-79-powerpc-smp  4.4.0-79.100
  linux-image-4.4.0-79-powerpc64-smp  4.4.0-79.100
  linux-image-aws                 4.4.0.1018.21
  linux-image-generic             4.4.0.79.85
  linux-image-generic-lpae        4.4.0.79.85
  linux-image-gke                 4.4.0.1014.16
  linux-image-lowlatency          4.4.0.79.85
  linux-image-powerpc-e500mc      4.4.0.79.85
  linux-image-powerpc-smp         4.4.0.79.85
  linux-image-powerpc64-emb       4.4.0.79.85
  linux-image-powerpc64-smp       4.4.0.79.85
  linux-image-raspi2              4.4.0.1057.58
  linux-image-snapdragon          4.4.0.1059.52
  linux-image-virtual             4.4.0.79.85

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.