Ubuntu 16.04 Advisory USN-3469-1 Critical: Kernel Security Fixes

ubuntu

October 31, 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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Anthony Perard discovered that the Xen virtual block driver did not

properly initialize some data structures before passing them to user space.

A local attacker in a guest VM could use this to expose sensitive

information from the host OS or other guest VMs. (CVE-2017-10911)

Bo Zhang discovered that the netlink wireless configuration interface in

the Linux kernel did not properly validate attributes when handling certain

requests. A local attacker with the CAP_NET_ADMIN could use this to cause a

denial of service (system crash). (CVE-2017-12153)

It was discovered t...

Read the Full Advisory

Topics Covered

security advisory denial of service critical Ubuntu kernel system crash data exposure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1009-kvm      4.4.0-1009.14
  linux-image-4.4.0-1033-gke      4.4.0-1033.33
  linux-image-4.4.0-1039-aws      4.4.0-1039.48
  linux-image-4.4.0-1076-raspi2   4.4.0-1076.84
  linux-image-4.4.0-1078-snapdragon  4.4.0-1078.83
  linux-image-4.4.0-98-generic    4.4.0-98.121
  linux-image-4.4.0-98-generic-lpae  4.4.0-98.121
  linux-image-4.4.0-98-lowlatency  4.4.0-98.121
  linux-image-4.4.0-98-powerpc-e500mc  4.4.0-98.121
  linux-image-4.4.0-98-powerpc-smp  4.4.0-98.121
  linux-image-4.4.0-98-powerpc64-emb  4.4.0-98.121
  linux-image-4.4.0-98-powerpc64-smp  4.4.0-98.121
  linux-image-aws                 4.4.0.1039.41
  linux-image-generic             4.4.0.98.103
  linux-image-generic-lpae        4.4.0.98.103
  linux-image-gke                 4.4.0.1033.34
  linux-image-kvm                 4.4.0.1009.9
  linux-image-lowlatency          4.4.0.98.103
  linux-image-powerpc-e500mc      4.4.0.98.103
  linux-image-powerpc-smp         4.4.0.98.103
  linux-image-powerpc64-emb       4.4.0.98.103
  linux-image-powerpc64-smp       4.4.0.98.103
  linux-image-raspi2              4.4.0.1076.76
  linux-image-snapdragon          4.4.0.1078.70

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.