Ubuntu 16.04 LTS: USN-3910-1 Medium: Linux Kernel Denial Of Service

ubuntu

March 15, 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 the f2fs filesystem implementation in the Linux

kernel did not handle the noflush_merge mount option correctly. An attacker

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

(CVE-2017-18241)

It was discovered that the procfs filesystem did not properly handle

processes mapping some memory elements onto files. A local attacker could

use this to block utilities that examine the procfs filesystem to report

operating system state, such as ps(1). (CVE-2018-1120)

Hui Peng and Mathias Payer discovered that the Option USB High Speed driver

in the Linux kernel did not properly validate metadata received from the

device. A physicall...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu kernel system crash

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1041-kvm      4.4.0-1041.47
  linux-image-4.4.0-1077-aws      4.4.0-1077.87
  linux-image-4.4.0-1104-raspi2   4.4.0-1104.112
  linux-image-4.4.0-1108-snapdragon  4.4.0-1108.113
  linux-image-4.4.0-143-generic   4.4.0-143.169
  linux-image-4.4.0-143-generic-lpae  4.4.0-143.169
  linux-image-4.4.0-143-lowlatency  4.4.0-143.169
  linux-image-4.4.0-143-powerpc-e500mc  4.4.0-143.169
  linux-image-4.4.0-143-powerpc-smp  4.4.0-143.169
  linux-image-4.4.0-143-powerpc64-emb  4.4.0-143.169
  linux-image-4.4.0-143-powerpc64-smp  4.4.0-143.169
  linux-image-aws                 4.4.0.1077.80
  linux-image-generic             4.4.0.143.151
  linux-image-generic-lpae        4.4.0.143.151
  linux-image-kvm                 4.4.0.1041.41
  linux-image-lowlatency          4.4.0.143.151
  linux-image-powerpc-e500mc      4.4.0.143.151
  linux-image-powerpc-smp         4.4.0.143.151
  linux-image-powerpc64-emb       4.4.0.143.151
  linux-image-powerpc64-smp       4.4.0.143.151
  linux-image-raspi2              4.4.0.1104.104
  linux-image-snapdragon          4.4.0.1108.100
  linux-image-virtual             4.4.0.143.151

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.