Ubuntu 18.04 LTS: USN-3847-1 Critical Kernel Security Fixes

ubuntu

December 20, 2018

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-azure: Linux kernel for Microsoft Azure Cloud systems

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

- linux-kvm: Linux kernel for cloud environments

- linux-oem: Linux kernel for OEM processors- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that a race condition existed in the raw MIDI driver for

the Linux kernel, leading to a double free vulnerability. A local attacker

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

execute arbitrary code. (CVE-2018-10902)

It was discovered that an integer overrun vulnerability existed in the

POSIX timers implementation in the Linux kernel. A local attacker could use

this to cause a denial of service. (CVE-2018-12896)

Noam Rathaus discovered that a use-after-free vulnerability existed in the

Infiniband im...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel ubuntu linux-aws linux-azure linux-gcp

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1026-gcp     4.15.0-1026.27
  linux-image-4.15.0-1028-kvm     4.15.0-1028.28
  linux-image-4.15.0-1030-oem     4.15.0-1030.35
  linux-image-4.15.0-1030-raspi2  4.15.0-1030.32
  linux-image-4.15.0-1031-aws     4.15.0-1031.33
  linux-image-4.15.0-1036-azure   4.15.0-1036.38
  linux-image-4.15.0-43-generic   4.15.0-43.46
  linux-image-4.15.0-43-generic-lpae  4.15.0-43.46
  linux-image-4.15.0-43-lowlatency  4.15.0-43.46
  linux-image-4.15.0-43-snapdragon  4.15.0-43.46
  linux-image-aws                 4.15.0.1031.30
  linux-image-azure               4.15.0.1036.36
  linux-image-gcp                 4.15.0.1026.28
  linux-image-generic             4.15.0.43.45
  linux-image-generic-lpae        4.15.0.43.45
  linux-image-gke                 4.15.0.1026.28
  linux-image-kvm                 4.15.0.1028.28
  linux-image-lowlatency          4.15.0.43.45
  linux-image-oem                 4.15.0.1030.35
  linux-image-raspi2              4.15.0.1030.28
  linux-image-snapdragon          4.15.0.43.45

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.