Ubuntu 4342-1 Critical Advisory: Kernel Crash and Exploits

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-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-raspi2: Linux kernel for Raspberry Pi 2

- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems

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

- linux-raspi2-5.3: Linux kernel for Raspberry Pi 2

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 execute arbitrary code. (CVE-2020-11884)

It was discovered that the Intel Wi-Fi driver in the Linux kernel did not

properly check for errors in some situations. A local attacker could

...

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 19.10:
  linux-image-5.3.0-1016-kvm      5.3.0-1016.17
  linux-image-5.3.0-1017-aws      5.3.0-1017.18
  linux-image-5.3.0-1018-gcp      5.3.0-1018.19
  linux-image-5.3.0-1020-azure    5.3.0-1020.21
  linux-image-5.3.0-1023-raspi2   5.3.0-1023.25
  linux-image-5.3.0-51-generic    5.3.0-51.44
  linux-image-5.3.0-51-generic-lpae  5.3.0-51.44
  linux-image-5.3.0-51-lowlatency  5.3.0-51.44
  linux-image-5.3.0-51-snapdragon  5.3.0-51.44
  linux-image-aws                 5.3.0.1017.19
  linux-image-azure               5.3.0.1020.39
  linux-image-gcp                 5.3.0.1018.19
  linux-image-generic             5.3.0.51.42
  linux-image-generic-lpae        5.3.0.51.42
  linux-image-gke                 5.3.0.1018.19
  linux-image-kvm                 5.3.0.1016.18
  linux-image-lowlatency          5.3.0.51.42
  linux-image-raspi2              5.3.0.1023.20
  linux-image-snapdragon          5.3.0.51.42
  linux-image-virtual             5.3.0.51.42

Ubuntu 18.04 LTS:
  linux-image-5.3.0-1018-gke      5.3.0-1018.19~18.04.1
  linux-image-5.3.0-1023-raspi2   5.3.0-1023.25~18.04.1
  linux-image-5.3.0-51-generic    5.3.0-51.44~18.04.2
  linux-image-5.3.0-51-generic-lpae  5.3.0-51.44~18.04.2
  linux-image-5.3.0-51-lowlatency  5.3.0-51.44~18.04.2
  linux-image-generic-hwe-18.04   5.3.0.51.104
  linux-image-generic-lpae-hwe-18.04  5.3.0.51.104
  linux-image-gke-5.3             5.3.0.1018.8
  linux-image-lowlatency-hwe-18.04  5.3.0.51.104
  linux-image-raspi2-hwe-18.04    5.3.0.1023.12
  linux-image-snapdragon-hwe-18.04  5.3.0.51.104
  linux-image-virtual-hwe-18.04   5.3.0.51.104

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.