Ubuntu 18.04 LTS USN-4285-1: Critical Kernel Memory Management Issues

ubuntu

February 18, 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-azure: Linux kernel for Microsoft Azure Cloud 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 Linux kernel did not properly clear data

structures on context switches for certain Intel graphics processors. A

local attacker could use this to expose sensitive information.

(CVE-2019-14615)

It was discovered that the HSA Linux kernel driver for AMD GPU devices did

not properly check for errors in certain situations, leading to a NULL

pointer dereference. A local attacker could possibly use this to cause a

denial of service. (CVE-2019-16229)

It was discovered that the Marvell 8xxx Libertas WLAN device driver in the

Linux kernel did not properl...

Read the Full Advisory

Topics Covered

security advisory DoS Ubuntu memory leak kernel information exposure context switch

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1011-oracle   5.0.0-1011.16
  linux-image-5.0.0-1025-aws      5.0.0-1025.28
  linux-image-5.0.0-1030-gke      5.0.0-1030.31
  linux-image-5.0.0-1031-gcp      5.0.0-1031.32
  linux-image-5.0.0-1032-azure    5.0.0-1032.34
  linux-image-azure               5.0.0.1032.43
  linux-image-gcp                 5.0.0.1031.35
  linux-image-gke-5.0             5.0.0.1030.18

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.