Ubuntu 16.04 LTS: USN-4163-1 Critical: Kernel Denial Of Service Risks

ubuntu

October 21, 2019

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 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that a race condition existed in the ARC EMAC ethernet

driver for the Linux kernel, resulting in a use-after-free vulnerability.

An attacker could use this to cause a denial of service (system crash).

(CVE-2016-10906)

It was discovered that a race condition existed in the Serial Attached SCSI

(SAS) implementation in the Linux kernel when handling certain error

conditions. A local attacker could use this to cause a denial of service

(kernel deadlock). (CVE-2017-18232)

It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not

did not handle detach operations correctly, leading to a use-after-free

vulnerability. A physical...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel patch ubuntu system crash linux driver

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1060-kvm      4.4.0-1060.67
  linux-image-4.4.0-1096-aws      4.4.0-1096.107
  linux-image-4.4.0-1124-raspi2   4.4.0-1124.133
  linux-image-4.4.0-1128-snapdragon  4.4.0-1128.136
  linux-image-4.4.0-166-generic   4.4.0-166.195
  linux-image-4.4.0-166-generic-lpae  4.4.0-166.195
  linux-image-4.4.0-166-lowlatency  4.4.0-166.195
  linux-image-4.4.0-166-powerpc-e500mc  4.4.0-166.195
  linux-image-4.4.0-166-powerpc-smp  4.4.0-166.195
  linux-image-4.4.0-166-powerpc64-emb  4.4.0-166.195
  linux-image-4.4.0-166-powerpc64-smp  4.4.0-166.195
  linux-image-aws                 4.4.0.1096.100
  linux-image-generic             4.4.0.166.174
  linux-image-generic-lpae        4.4.0.166.174
  linux-image-kvm                 4.4.0.1060.60
  linux-image-lowlatency          4.4.0.166.174
  linux-image-powerpc-e500mc      4.4.0.166.174
  linux-image-powerpc-smp         4.4.0.166.174
  linux-image-powerpc64-emb       4.4.0.166.174
  linux-image-powerpc64-smp       4.4.0.166.174
  linux-image-raspi2              4.4.0.1124.124
  linux-image-snapdragon          4.4.0.1128.120
  linux-image-virtual             4.4.0.166.174

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.