Ubuntu 22.04 LTS USN-5624-1 Critical: Kernel Denial Of Service Issues

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: Linux kernel for Microsoft Azure Cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-lowlatency: Linux low latency kernel

- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems

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 of service

(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

Duoming Zhou discovered that race conditions existed in the timer handling

implementation of the Linux kernel's Rose X.25 protocol layer, resulting in

use-after-free vulnerabilities. A local attacker could use this ...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu kernel system update

Update Instructions

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

Ubuntu 22.04 LTS:
  linux-image-5.15.0-1018-kvm     5.15.0-1018.22
  linux-image-5.15.0-1020-aws     5.15.0-1020.24
  linux-image-5.15.0-1020-azure   5.15.0-1020.25
  linux-image-5.15.0-48-generic   5.15.0-48.54
  linux-image-5.15.0-48-generic-64k  5.15.0-48.54
  linux-image-5.15.0-48-generic-lpae  5.15.0-48.54
  linux-image-5.15.0-48-lowlatency  5.15.0-48.54
  linux-image-5.15.0-48-lowlatency-64k  5.15.0-48.54
  linux-image-aws                 5.15.0.1020.20
  linux-image-azure               5.15.0.1020.19
  linux-image-generic             5.15.0.48.48
  linux-image-generic-64k         5.15.0.48.48
  linux-image-generic-64k-hwe-22.04  5.15.0.48.48
  linux-image-generic-hwe-22.04   5.15.0.48.48
  linux-image-generic-lpae        5.15.0.48.48
  linux-image-generic-lpae-hwe-22.04  5.15.0.48.48
  linux-image-kvm                 5.15.0.1018.16
  linux-image-lowlatency          5.15.0.48.45
  linux-image-lowlatency-64k      5.15.0.48.45
  linux-image-lowlatency-64k-hwe-22.04  5.15.0.48.45
  linux-image-lowlatency-hwe-22.04  5.15.0.48.45
  linux-image-oem-20.04           5.15.0.48.48
  linux-image-virtual             5.15.0.48.48
  linux-image-virtual-hwe-22.04   5.15.0.48.48

Ubuntu 20.04 LTS:
  linux-image-5.15.0-1020-aws     5.15.0-1020.24~20.04.1
  linux-image-5.15.0-1020-azure   5.15.0-1020.25~20.04.1
  linux-image-aws                 5.15.0.1020.24~20.04.12
  linux-image-azure               5.15.0.1020.25~20.04.13

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.