Ubuntu 18.10 USN-3930-1 Critical: Kernel Issues Cause Denial Of Service

ubuntu

April 2, 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

Details:

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the

Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate

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

(CVE-2018-19824)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information

leak in the Bluetooth implementation of the Linux kernel. An attacker

within Bluetooth range could use this to expose sensitive information

(kernel memory). (CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel

contained a use-after-free...

Read the Full Advisory

Topics Covered

security advisory denial of service information leak Ubuntu critical severity kernel issue cloud environments

Update Instructions

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

Ubuntu 18.10:
  linux-image-4.18.0-1008-gcp     4.18.0-1008.9
  linux-image-4.18.0-1009-kvm     4.18.0-1009.9
  linux-image-4.18.0-1011-raspi2  4.18.0-1011.13
  linux-image-4.18.0-1012-aws     4.18.0-1012.14
  linux-image-4.18.0-1014-azure   4.18.0-1014.14
  linux-image-4.18.0-17-generic   4.18.0-17.18
  linux-image-4.18.0-17-generic-lpae  4.18.0-17.18
  linux-image-4.18.0-17-lowlatency  4.18.0-17.18
  linux-image-4.18.0-17-snapdragon  4.18.0-17.18
  linux-image-aws                 4.18.0.1012.12
  linux-image-azure               4.18.0.1014.15
  linux-image-gcp                 4.18.0.1008.8
  linux-image-generic             4.18.0.17.18
  linux-image-generic-lpae        4.18.0.17.18
  linux-image-gke                 4.18.0.1008.8
  linux-image-kvm                 4.18.0.1009.9
  linux-image-lowlatency          4.18.0.17.18
  linux-image-raspi2              4.18.0.1011.8
  linux-image-snapdragon          4.18.0.17.18
  linux-image-virtual             4.18.0.17.18

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.