Ubuntu 18.04 LTS: USN-4749-1 Critical Denial of Service Flaws

ubuntu

February 25, 2021

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-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-dell300x: Linux kernel for Dell 300x platforms

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems

- linux-snapdragon: Linux kernel for Qualcomm 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:

Bodong Zhao discovered a use-after-free in the Sun keyboard driver

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Read the Full Advisory

Topics Covered

security advisory denial of service security issue critical software update critical fix software fix kernel system update kernel issue ubuntu

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1012-dell300x  4.15.0-1012.16
  linux-image-4.15.0-1065-oracle  4.15.0-1065.73
  linux-image-4.15.0-1079-gke     4.15.0-1079.84
  linux-image-4.15.0-1079-raspi2  4.15.0-1079.84
  linux-image-4.15.0-1085-kvm     4.15.0-1085.87
  linux-image-4.15.0-1093-gcp     4.15.0-1093.106
  linux-image-4.15.0-1094-aws     4.15.0-1094.101
  linux-image-4.15.0-1096-snapdragon  4.15.0-1096.105
  linux-image-4.15.0-1108-azure   4.15.0-1108.120
  linux-image-4.15.0-136-generic  4.15.0-136.140
  linux-image-4.15.0-136-generic-lpae  4.15.0-136.140
  linux-image-4.15.0-136-lowlatency  4.15.0-136.140
  linux-image-aws-lts-18.04       4.15.0.1094.97
  linux-image-azure-lts-18.04     4.15.0.1108.81
  linux-image-dell300x            4.15.0.1012.14
  linux-image-gcp-lts-18.04       4.15.0.1093.111
  linux-image-generic             4.15.0.136.123
  linux-image-generic-lpae        4.15.0.136.123
  linux-image-gke                 4.15.0.1079.83
  linux-image-gke-4.15            4.15.0.1079.83
  linux-image-kvm                 4.15.0.1085.81
  linux-image-lowlatency          4.15.0.136.123
  linux-image-oracle-lts-18.04    4.15.0.1065.75
  linux-image-powerpc-e500mc      4.15.0.136.123
  linux-image-powerpc-smp         4.15.0.136.123
  linux-image-powerpc64-emb       4.15.0.136.123
  linux-image-powerpc64-smp       4.15.0.136.123
  linux-image-raspi2              4.15.0.1079.76
  linux-image-snapdragon          4.15.0.1096.99
  linux-image-virtual             4.15.0.136.123

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1065-oracle  4.15.0-1065.73~16.04.1
  linux-image-4.15.0-1093-gcp     4.15.0-1093.106~16.04.1
  linux-image-4.15.0-1094-aws     4.15.0-1094.101~16.04.1
  linux-image-4.15.0-1108-azure   4.15.0-1108.120~16.04.1
  linux-image-4.15.0-136-generic  4.15.0-136.140~16.04.1
  linux-image-4.15.0-136-generic-lpae  4.15.0-136.140~16.04.1
  linux-image-4.15.0-136-lowlatency  4.15.0-136.140~16.04.1
  linux-image-aws-hwe             4.15.0.1094.87
  linux-image-azure               4.15.0.1108.99
  linux-image-gcp                 4.15.0.1093.94
  linux-image-generic-hwe-16.04   4.15.0.136.132
  linux-image-generic-lpae-hwe-16.04  4.15.0.136.132
  linux-image-gke                 4.15.0.1093.94
  linux-image-lowlatency-hwe-16.04  4.15.0.136.132
  linux-image-oem                 4.15.0.136.132
  linux-image-oracle              4.15.0.1065.53
  linux-image-virtual-hwe-16.04   4.15.0.136.132

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1108-azure   4.15.0-1108.120~14.04.1
  linux-image-azure               4.15.0.1108.81

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.