==========================================================================
Ubuntu Security Notice USN-4008-1
June 04, 2019

linux, linux-aws, linux-kvm, 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 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:

Robert Święcki discovered that the Linux kernel did not properly apply
Address Space Layout Randomization (ASLR) in some situations for setuid elf
binaries. A local attacker could use this to improve the chances of
exploiting an existing vulnerability in a setuid elf binary.
(CVE-2019-11190)

It was discovered that a null pointer dereference vulnerability existed in
the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash). (CVE-2019-11810)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

Federico Manuel Bento discovered that the Linux kernel did not properly
apply Address Space Layout Randomization (ASLR) in some situations for
setuid a.out binaries. A local attacker could use this to improve the
chances of exploiting an existing vulnerability in a setuid a.out binary.
(CVE-2019-11191)

As a hardening measure, this update disables a.out support.

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1047-kvm      4.4.0-1047.53
  linux-image-4.4.0-1084-aws      4.4.0-1084.94
  linux-image-4.4.0-1110-raspi2   4.4.0-1110.118
  linux-image-4.4.0-1114-snapdragon  4.4.0-1114.119
  linux-image-4.4.0-150-generic   4.4.0-150.176
  linux-image-4.4.0-150-generic-lpae  4.4.0-150.176
  linux-image-4.4.0-150-lowlatency  4.4.0-150.176
  linux-image-4.4.0-150-powerpc-e500mc  4.4.0-150.176
  linux-image-4.4.0-150-powerpc-smp  4.4.0-150.176
  linux-image-4.4.0-150-powerpc64-emb  4.4.0-150.176
  linux-image-4.4.0-150-powerpc64-smp  4.4.0-150.176
  linux-image-aws                 4.4.0.1084.87
  linux-image-generic             4.4.0.150.158
  linux-image-generic-lpae        4.4.0.150.158
  linux-image-kvm                 4.4.0.1047.47
  linux-image-lowlatency          4.4.0.150.158
  linux-image-powerpc-e500mc      4.4.0.150.158
  linux-image-powerpc-smp         4.4.0.150.158
  linux-image-powerpc64-emb       4.4.0.150.158
  linux-image-powerpc64-smp       4.4.0.150.158
  linux-image-raspi2              4.4.0.1110.110
  linux-image-snapdragon          4.4.0.1114.106
  linux-image-virtual             4.4.0.150.158

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.

References:
  https://usn.ubuntu.com/4008-1
  CVE-2019-11190, CVE-2019-11191, CVE-2019-11810, CVE-2019-11815

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-150.176
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1084.94
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1047.53
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1110.118
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1114.119