Ubuntu 19.04 USN-4069-1 moderate: Linux Kernel Denial Of Service

ubuntu

July 23, 2019

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-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that an integer overflow existed in the Linux kernel when

reference counting pages, leading to potential use-after-free issues. A

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

or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel when

performing core dumps. A local attacker could use this to cause a denial of

service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the ext4 fil...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu integer overflow sensitive information linux kernel cloud environments

Update Instructions

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

Ubuntu 19.04:
  linux-image-5.0.0-1011-aws      5.0.0-1011.12
  linux-image-5.0.0-1011-gcp      5.0.0-1011.11
  linux-image-5.0.0-1011-kvm      5.0.0-1011.12
  linux-image-5.0.0-1012-azure    5.0.0-1012.12
  linux-image-5.0.0-1013-raspi2   5.0.0-1013.13
  linux-image-5.0.0-1017-snapdragon  5.0.0-1017.18
  linux-image-5.0.0-21-generic    5.0.0-21.22
  linux-image-5.0.0-21-generic-lpae  5.0.0-21.22
  linux-image-5.0.0-21-lowlatency  5.0.0-21.22
  linux-image-aws                 5.0.0.1011.11
  linux-image-azure               5.0.0.1012.11
  linux-image-gcp                 5.0.0.1011.11
  linux-image-generic             5.0.0.21.22
  linux-image-generic-lpae        5.0.0.21.22
  linux-image-gke                 5.0.0.1011.11
  linux-image-kvm                 5.0.0.1011.11
  linux-image-lowlatency          5.0.0.21.22
  linux-image-raspi2              5.0.0.1013.10
  linux-image-snapdragon          5.0.0.1017.10
  linux-image-virtual             5.0.0.21.22

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.