=========================================================================Ubuntu Security Notice USN-4007-1
June 04, 2019

linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle,
linux-raspi2, linux-snapdragon vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

A system hardening measure could be bypassed.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-meta: 
- linux-oem: Linux kernel for OEM processors
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

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.

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 18.04 LTS:
  linux-image-4.15.0-1014-oracle  4.15.0-1014.16
  linux-image-4.15.0-1033-gcp     4.15.0-1033.35
  linux-image-4.15.0-1035-kvm     4.15.0-1035.35
  linux-image-4.15.0-1037-raspi2  4.15.0-1037.39
  linux-image-4.15.0-1039-oem     4.15.0-1039.44
  linux-image-4.15.0-1040-aws     4.15.0-1040.42
  linux-image-4.15.0-1054-snapdragon  4.15.0-1054.58
  linux-image-4.15.0-51-generic   4.15.0-51.55
  linux-image-4.15.0-51-generic-lpae  4.15.0-51.55
  linux-image-4.15.0-51-lowlatency  4.15.0-51.55
  linux-image-aws                 4.15.0.1040.39
  linux-image-gcp                 4.15.0.1033.35
  linux-image-generic             4.15.0.51.53
  linux-image-generic-lpae        4.15.0.51.53
  linux-image-kvm                 4.15.0.1035.35
  linux-image-lowlatency          4.15.0.51.53
  linux-image-oem                 4.15.0.1039.43
  linux-image-oracle              4.15.0.1014.17
  linux-image-raspi2              4.15.0.1037.35
  linux-image-snapdragon          4.15.0.1054.57

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://ubuntu.com/security/notices/USN-4007-1
  CVE-2019-11191

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-51.55
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1040.42
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1033.35
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1035.35
  https://launchpad.net/ubuntu/+source/linux-meta/4.15.0.51.53
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1039.44
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1014.16
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1037.39
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1054.58