Ubuntu 18.04 LTS: USN-4440-1: Critical Kernel Issues Addressed

ubuntu

July 27, 2020

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-5.3: linux kernel for microsoft azure cloud systems

- linux-gcp-5.3: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

- linux-oracle-5.3: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the network block device (nbd) implementation in the

Linux kernel did not properly check for error conditions in some

situations. An attacker could possibly use this to cause a denial of

service (system crash). (CVE-2019-16089)

It was discovered that the kernel->user space relay implementation in the

Linux kernel did not properly check return values in some situations. A

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

crash). (CVE-2019-19462)

Chuhong Yuan discovered that go7007 USB audio device driver in the Linux

kernel did n...

Read the Full Advisory

Topics Covered

security advisory denial of service ubuntu memory exhaustion system crash linux kernel privileged escalation

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.3.0-1030-oracle   5.3.0-1030.32~18.04.1
  linux-image-5.3.0-1032-gcp      5.3.0-1032.34~18.04.1
  linux-image-5.3.0-1032-gke      5.3.0-1032.34~18.04.1
  linux-image-5.3.0-1034-azure    5.3.0-1034.35~18.04.1
  linux-image-5.3.0-64-generic    5.3.0-64.58~18.04.1
  linux-image-5.3.0-64-generic-lpae  5.3.0-64.58~18.04.1
  linux-image-5.3.0-64-lowlatency  5.3.0-64.58~18.04.1
  linux-image-azure               5.3.0.1034.30
  linux-image-gcp                 5.3.0.1032.26
  linux-image-gke-5.3             5.3.0.1032.17
  linux-image-gkeop-5.3           5.3.0.64.120
  linux-image-oracle              5.3.0.1030.27

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.