Ubuntu 16.04 LTS: USN-4427-1 Moderate: Linux Kernel Security Issues

ubuntu

July 22, 2020

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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi (V7) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that the Kvaser CAN/USB driver in the Linux kernel did

not properly initialize memory in certain situations. A local attacker

could possibly use this to expose sensitive information (kernel memory).

(CVE-2019-19947)

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

kernel did not properly deallocate memory in some failure conditions. A

physically proximate attacker could use this to cause a denial of service

(memory exhaustion). (CVE-2019-20810)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux

kern...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel fix memory exposure Ubuntu LTS

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1077-kvm      4.4.0-1077.84
  linux-image-4.4.0-1111-aws      4.4.0-1111.123
  linux-image-4.4.0-1136-raspi2   4.4.0-1136.145
  linux-image-4.4.0-1140-snapdragon  4.4.0-1140.148
  linux-image-4.4.0-186-generic   4.4.0-186.216
  linux-image-4.4.0-186-generic-lpae  4.4.0-186.216
  linux-image-4.4.0-186-lowlatency  4.4.0-186.216
  linux-image-4.4.0-186-powerpc-e500mc  4.4.0-186.216
  linux-image-4.4.0-186-powerpc-smp  4.4.0-186.216
  linux-image-4.4.0-186-powerpc64-emb  4.4.0-186.216
  linux-image-4.4.0-186-powerpc64-smp  4.4.0-186.216
  linux-image-aws                 4.4.0.1111.116
  linux-image-generic             4.4.0.186.192
  linux-image-generic-lpae        4.4.0.186.192
  linux-image-kvm                 4.4.0.1077.75
  linux-image-lowlatency          4.4.0.186.192
  linux-image-powerpc-e500mc      4.4.0.186.192
  linux-image-powerpc-smp         4.4.0.186.192
  linux-image-powerpc64-emb       4.4.0.186.192
  linux-image-powerpc64-smp       4.4.0.186.192
  linux-image-raspi2              4.4.0.1136.136
  linux-image-snapdragon          4.4.0.1140.132
  linux-image-virtual             4.4.0.186.192

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1075-aws      4.4.0-1075.79
  linux-image-4.4.0-186-generic   4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-generic-lpae  4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-lowlatency  4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-powerpc-e500mc  4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-powerpc-smp  4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-powerpc64-emb  4.4.0-186.216~14.04.1
  linux-image-4.4.0-186-powerpc64-smp  4.4.0-186.216~14.04.1
  linux-image-aws                 4.4.0.1075.72
  linux-image-generic-lpae-lts-xenial  4.4.0.186.163
  linux-image-generic-lts-xenial  4.4.0.186.163
  linux-image-lowlatency-lts-xenial  4.4.0.186.163
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.186.163
  linux-image-powerpc-smp-lts-xenial  4.4.0.186.163
  linux-image-powerpc64-emb-lts-xenial  4.4.0.186.163
  linux-image-powerpc64-smp-lts-xenial  4.4.0.186.163
  linux-image-virtual-lts-xenial  4.4.0.186.163

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.