Ubuntu 18.04 LTS: USN-4345-1 Critical: Kernel Denial Of Service Issues

ubuntu

April 28, 2020

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-gke-4.15: Linux kernel for Google Container Engine (GKE) 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

- linux-snapdragon: Linux kernel for Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

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

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Al Viro discovered that the Linux kernel for s390x systems did not properly

perform page table upgrades for kernel sections that use secondary address

mode. A local attacker could use this to cause a denial of service (system

crash) or execut...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow ubuntu system crash linux kernel device driver

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1038-oracle  4.15.0-1038.42
  linux-image-4.15.0-1058-gke     4.15.0-1058.61
  linux-image-4.15.0-1059-kvm     4.15.0-1059.60
  linux-image-4.15.0-1061-raspi2  4.15.0-1061.65
  linux-image-4.15.0-1066-aws     4.15.0-1066.70
  linux-image-4.15.0-1077-snapdragon  4.15.0-1077.84
  linux-image-4.15.0-1080-oem     4.15.0-1080.90
  linux-image-4.15.0-99-generic   4.15.0-99.100
  linux-image-4.15.0-99-generic-lpae  4.15.0-99.100
  linux-image-4.15.0-99-lowlatency  4.15.0-99.100
  linux-image-aws-lts-18.04       4.15.0.1066.69
  linux-image-generic             4.15.0.99.89
  linux-image-generic-lpae        4.15.0.99.89
  linux-image-gke                 4.15.0.1058.62
  linux-image-gke-4.15            4.15.0.1058.62
  linux-image-kvm                 4.15.0.1059.59
  linux-image-lowlatency          4.15.0.99.89
  linux-image-oem                 4.15.0.1080.84
  linux-image-oracle-lts-18.04    4.15.0.1038.47
  linux-image-powerpc-e500mc      4.15.0.99.89
  linux-image-powerpc-smp         4.15.0.99.89
  linux-image-powerpc64-emb       4.15.0.99.89
  linux-image-powerpc64-smp       4.15.0.99.89
  linux-image-raspi2              4.15.0.1061.59
  linux-image-snapdragon          4.15.0.1077.80
  linux-image-virtual             4.15.0.99.89

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1038-oracle  4.15.0-1038.42~16.04.1
  linux-image-4.15.0-1061-gcp     4.15.0-1061.65
  linux-image-4.15.0-1066-aws     4.15.0-1066.70~16.04.1
  linux-image-4.15.0-1082-azure   4.15.0-1082.92~16.04.1
  linux-image-4.15.0-99-generic   4.15.0-99.100~16.04.1
  linux-image-4.15.0-99-generic-lpae  4.15.0-99.100~16.04.1
  linux-image-4.15.0-99-lowlatency  4.15.0-99.100~16.04.1
  linux-image-aws-hwe             4.15.0.1066.66
  linux-image-azure               4.15.0.1082.81
  linux-image-azure-edge          4.15.0.1082.81
  linux-image-gcp                 4.15.0.1061.75
  linux-image-generic-hwe-16.04   4.15.0.99.106
  linux-image-generic-lpae-hwe-16.04  4.15.0.99.106
  linux-image-gke                 4.15.0.1061.75
  linux-image-lowlatency-hwe-16.04  4.15.0.99.106
  linux-image-oem                 4.15.0.99.106
  linux-image-oracle              4.15.0.1038.31
  linux-image-virtual-hwe-16.04   4.15.0.99.106

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.