Ubuntu 18.04 LTS USN-5621-1 Critical DoS: Kernel Update Required

ubuntu

September 21, 2022

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-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

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

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

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

Details:

It was discovered that the framebuffer driver on the Linux kernel did not

verify size limits when changing font or screen size, leading to an out-of-bounds write. A local attacker could use this to cause a denial ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical code execution kernel ubuntu

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1053-dell300x  4.15.0-1053.58
  linux-image-4.15.0-1106-oracle  4.15.0-1106.117
  linux-image-4.15.0-1119-raspi2  4.15.0-1119.127
  linux-image-4.15.0-1127-kvm     4.15.0-1127.132
  linux-image-4.15.0-1136-gcp     4.15.0-1136.152
  linux-image-4.15.0-1137-snapdragon  4.15.0-1137.147
  linux-image-4.15.0-1141-aws     4.15.0-1141.152
  linux-image-4.15.0-1151-azure   4.15.0-1151.166
  linux-image-4.15.0-193-generic  4.15.0-193.204
  linux-image-4.15.0-193-generic-lpae  4.15.0-193.204
  linux-image-4.15.0-193-lowlatency  4.15.0-193.204
  linux-image-aws-lts-18.04       4.15.0.1141.141
  linux-image-azure-lts-18.04     4.15.0.1151.121
  linux-image-dell300x            4.15.0.1053.53
  linux-image-gcp-lts-18.04       4.15.0.1136.152
  linux-image-generic             4.15.0.193.178
  linux-image-generic-lpae        4.15.0.193.178
  linux-image-kvm                 4.15.0.1127.120
  linux-image-lowlatency          4.15.0.193.178
  linux-image-oracle-lts-18.04    4.15.0.1106.113
  linux-image-raspi2              4.15.0.1119.116
  linux-image-snapdragon          4.15.0.1137.138
  linux-image-virtual             4.15.0.193.178

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1106-oracle  4.15.0-1106.117~16.04.1
  linux-image-4.15.0-1136-gcp     4.15.0-1136.152~16.04.1
  linux-image-4.15.0-1141-aws-hwe  4.15.0-1141.152~16.04.1
  linux-image-4.15.0-193-generic  4.15.0-193.204~16.04.1
  linux-image-4.15.0-193-lowlatency  4.15.0-193.204~16.04.1
  linux-image-aws-hwe             4.15.0.1141.128
  linux-image-gcp                 4.15.0.1136.130
  linux-image-generic-hwe-16.04   4.15.0.193.180
  linux-image-gke                 4.15.0.1136.130
  linux-image-lowlatency-hwe-16.04  4.15.0.193.180
  linux-image-oem                 4.15.0.193.180
  linux-image-oracle              4.15.0.1106.90
  linux-image-virtual-hwe-16.04   4.15.0.193.180

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.