Ubuntu 16.04 LTS USN-3619-1 Moderate: Kernel Security Issues

ubuntu

April 4, 2018

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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation

in the Linux kernel improperly performed sign extension in some situations.

A local attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2017-16995)

It was discovered that a race condition leading to a use-after-free

vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A

local attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2017-0861)

It was discovered that the KVM implementation in the Linux kernel allowed

passthrough of the di...

Read the Full Advisory

Topics Covered

security advisory moderate security issue Ubuntu kernel local attack system crash

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1020-kvm      4.4.0-1020.25
  linux-image-4.4.0-1054-aws      4.4.0-1054.63
  linux-image-4.4.0-1086-raspi2   4.4.0-1086.94
  linux-image-4.4.0-1088-snapdragon  4.4.0-1088.93
  linux-image-4.4.0-119-generic   4.4.0-119.143
  linux-image-4.4.0-119-generic-lpae  4.4.0-119.143
  linux-image-4.4.0-119-lowlatency  4.4.0-119.143
  linux-image-4.4.0-119-powerpc-e500mc  4.4.0-119.143
  linux-image-4.4.0-119-powerpc-smp  4.4.0-119.143
  linux-image-4.4.0-119-powerpc64-emb  4.4.0-119.143
  linux-image-4.4.0-119-powerpc64-smp  4.4.0-119.143
  linux-image-aws                 4.4.0.1054.56
  linux-image-generic             4.4.0.119.125
  linux-image-generic-lpae        4.4.0.119.125
  linux-image-kvm                 4.4.0.1020.19
  linux-image-lowlatency          4.4.0.119.125
  linux-image-powerpc-e500mc      4.4.0.119.125
  linux-image-powerpc-smp         4.4.0.119.125
  linux-image-powerpc64-emb       4.4.0.119.125
  linux-image-powerpc64-smp       4.4.0.119.125
  linux-image-raspi2              4.4.0.1086.86
  linux-image-snapdragon          4.4.0.1088.80

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.