Ubuntu 18.04 LTS: USN-4258-1: Moderate: Kernel Denial of Service Issues

ubuntu

January 28, 2020

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws-5.0: Linux kernel for Amazon Web Services (AWS) systems

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

- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems

- linux-oracle-5.0: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the Atheros 802.11ac wireless USB device driver in

the Linux kernel did not properly validate device metadata. A physically

proximate attacker could use this to cause a denial of service (system

crash). (CVE-2019-15099)

It was discovered that a race condition existed in the Virtual Video Test

Driver in the Linux kernel. An attacker with write access to /dev/video0 on

a system with the vivid module loaded could possibly use this to gain

administrative privileges. (CVE-2019-18683)

It was discovered that the btrfs file system in the Linux kernel did not

properly validate metadata, leading to a NULL pointer derefe...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel ubuntu memory exhaustion system crash device driver

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1010-oracle   5.0.0-1010.15~18.04.1
  linux-image-5.0.0-1024-aws      5.0.0-1024.27~18.04.1
  linux-image-5.0.0-1029-gcp      5.0.0-1029.30~18.04.1
  linux-image-5.0.0-1029-gke      5.0.0-1029.30~18.04.1
  linux-image-aws-edge            5.0.0.1024.38
  linux-image-gcp                 5.0.0.1029.33
  linux-image-gke-5.0             5.0.0.1029.17
  linux-image-oracle-edge         5.0.0.1010.9

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.