Ubuntu 16.04 LTS USN-4681-1 Critical: DoS and Memory Exposure

ubuntu

January 5, 2021

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 (V8) systems

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

Details:

Ryan Hall discovered that the Intel 700 Series Ethernet Controllers driver

in the Linux kernel did not properly deallocate memory in some conditions.

A local attacker could use this to cause a denial of service (kernel memory

exhaustion). (CVE-2019-0148)

It was discovered that the console keyboard driver in the Linux kernel

contained a race condition. A local attacker could use this to expose

sensitive information (kernel memory). (CVE-2020-25656)

Minh Yuan discovered that the tty driver in the Linux kernel contained race

conditions when handling fonts. A local...

Read the Full Advisory

Topics Covered

security advisory denial of service critical Ubuntu kernel system update memory exhaustion Linux kernel memory exposure sensitive information exposure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1085-kvm      4.4.0-1085.94
  linux-image-4.4.0-1119-aws      4.4.0-1119.133
  linux-image-4.4.0-1143-raspi2   4.4.0-1143.153
  linux-image-4.4.0-1147-snapdragon  4.4.0-1147.157
  linux-image-4.4.0-198-generic   4.4.0-198.230
  linux-image-4.4.0-198-generic-lpae  4.4.0-198.230
  linux-image-4.4.0-198-lowlatency  4.4.0-198.230
  linux-image-4.4.0-198-powerpc-e500mc  4.4.0-198.230
  linux-image-4.4.0-198-powerpc-smp  4.4.0-198.230
  linux-image-4.4.0-198-powerpc64-emb  4.4.0-198.230
  linux-image-4.4.0-198-powerpc64-smp  4.4.0-198.230
  linux-image-aws                 4.4.0.1119.124
  linux-image-generic             4.4.0.198.204
  linux-image-generic-lpae        4.4.0.198.204
  linux-image-kvm                 4.4.0.1085.83
  linux-image-lowlatency          4.4.0.198.204
  linux-image-powerpc-e500mc      4.4.0.198.204
  linux-image-powerpc-smp         4.4.0.198.204
  linux-image-powerpc64-emb       4.4.0.198.204
  linux-image-powerpc64-smp       4.4.0.198.204
  linux-image-raspi2              4.4.0.1143.143
  linux-image-snapdragon          4.4.0.1147.139
  linux-image-virtual             4.4.0.198.204

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1083-aws      4.4.0-1083.87
  linux-image-4.4.0-198-generic   4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-generic-lpae  4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-lowlatency  4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-powerpc-e500mc  4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-powerpc-smp  4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-powerpc64-emb  4.4.0-198.230~14.04.1
  linux-image-4.4.0-198-powerpc64-smp  4.4.0-198.230~14.04.1
  linux-image-aws                 4.4.0.1083.80
  linux-image-generic-lpae-lts-xenial  4.4.0.198.173
  linux-image-generic-lts-xenial  4.4.0.198.173
  linux-image-lowlatency-lts-xenial  4.4.0.198.173
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.198.173
  linux-image-powerpc-smp-lts-xenial  4.4.0.198.173
  linux-image-powerpc64-emb-lts-xenial  4.4.0.198.173
  linux-image-powerpc64-smp-lts-xenial  4.4.0.198.173
  linux-image-virtual-lts-xenial  4.4.0.198.173

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.