Ubuntu 18.04 LTS: USN-3931-1 Moderate: Kernel Security Issues Fixed

ubuntu

April 2, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oem: Linux kernel for OEM processors- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not

properly set up all arguments to an error handler callback used when

running as a paravirtualized guest. An unprivileged attacker in a

paravirtualized guest VM could use this to cause a denial of service (guest

VM crash). (CVE-2018-14678)

It was discovered that the KVM implementation in the Linux kernel on ARM

64bit processors did not properly handle some ioctls. An attacker with the

privilege to create KVM-based virtual machines could use this to cause a

denial of service (host sys...

Read the Full Advisory

Topics Covered

security advisory denial of service information leak update kernel ubuntu linux

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1010-oracle  4.15.0-1010.12
  linux-image-4.15.0-1029-gcp     4.15.0-1029.31
  linux-image-4.15.0-1031-kvm     4.15.0-1031.31
  linux-image-4.15.0-1033-raspi2  4.15.0-1033.35
  linux-image-4.15.0-1035-aws     4.15.0-1035.37
  linux-image-4.15.0-1035-oem     4.15.0-1035.40
  linux-image-4.15.0-47-generic   4.15.0-47.50
  linux-image-4.15.0-47-generic-lpae  4.15.0-47.50
  linux-image-4.15.0-47-lowlatency  4.15.0-47.50
  linux-image-4.15.0-47-snapdragon  4.15.0-47.50
  linux-image-aws                 4.15.0.1035.34
  linux-image-gcp                 4.15.0.1029.31
  linux-image-generic             4.15.0.47.49
  linux-image-generic-lpae        4.15.0.47.49
  linux-image-gke                 4.15.0.1029.31
  linux-image-kvm                 4.15.0.1031.31
  linux-image-lowlatency          4.15.0.47.49
  linux-image-oem                 4.15.0.1035.40
  linux-image-oracle              4.15.0.1010.13
  linux-image-raspi2              4.15.0.1033.31
  linux-image-snapdragon          4.15.0.47.49
  linux-image-virtual             4.15.0.47.49

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.