Ubuntu 22.04 LTS USN-5469-1 Critical: Kernel Issues Exploitable

ubuntu

June 8, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-ibm: Linux kernel for IBM cloud systems

- linux-intel-iotg: Linux kernel for Intel IoT platforms

- linux-kvm: Linux kernel for cloud environments

- linux-lowlatency: Linux low latency kernel

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the Linux kernel did not properly restrict access to

the kernel debugger when booted in secure boot environments. A privileged

attacker could use this to bypass UEFI Secure Boot restrictions.

(CVE-2022-21499)

Aaron Adams discovered that the netfilter subsystem in the Lin...

Read the Full Advisory

Topics Covered

security advisory critical DoS kernel ubuntu access restriction user space exploit

Update Instructions

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

Ubuntu 22.04 LTS:
  linux-image-5.15.0-1007-ibm     5.15.0-1007.8
  linux-image-5.15.0-1008-gcp     5.15.0-1008.12
  linux-image-5.15.0-1008-gke     5.15.0-1008.10
  linux-image-5.15.0-1008-intel-iotg  5.15.0-1008.11
  linux-image-5.15.0-1009-oracle  5.15.0-1009.12
  linux-image-5.15.0-1010-azure   5.15.0-1010.12
  linux-image-5.15.0-1010-kvm     5.15.0-1010.11
  linux-image-5.15.0-1011-aws     5.15.0-1011.14
  linux-image-5.15.0-1011-raspi   5.15.0-1011.13
  linux-image-5.15.0-1011-raspi-nolpae  5.15.0-1011.13
  linux-image-5.15.0-37-generic   5.15.0-37.39
  linux-image-5.15.0-37-generic-64k  5.15.0-37.39
  linux-image-5.15.0-37-generic-lpae  5.15.0-37.39
  linux-image-5.15.0-37-lowlatency  5.15.0-37.39
  linux-image-5.15.0-37-lowlatency-64k  5.15.0-37.39
  linux-image-aws                 5.15.0.1011.12
  linux-image-azure               5.15.0.1010.10
  linux-image-gcp                 5.15.0.1008.8
  linux-image-generic             5.15.0.37.39
  linux-image-generic-64k         5.15.0.37.39
  linux-image-generic-hwe-22.04   5.15.0.37.39
  linux-image-generic-lpae        5.15.0.37.39
  linux-image-generic-lpae-hwe-22.04  5.15.0.37.39
  linux-image-gke                 5.15.0.1008.12
  linux-image-gke-5.15            5.15.0.1008.12
  linux-image-ibm                 5.15.0.1007.7
  linux-image-intel-iotg          5.15.0.1008.9
  linux-image-kvm                 5.15.0.1010.9
  linux-image-lowlatency          5.15.0.37.37
  linux-image-lowlatency-64k      5.15.0.37.37
  linux-image-lowlatency-64k-hwe-22.04  5.15.0.37.37
  linux-image-lowlatency-hwe-22.04  5.15.0.37.37
  linux-image-oem-20.04           5.15.0.37.39
  linux-image-oracle              5.15.0.1009.8
  linux-image-raspi               5.15.0.1011.10
  linux-image-raspi-nolpae        5.15.0.1011.10
  linux-image-virtual             5.15.0.37.39
  linux-image-virtual-hwe-22.04   5.15.0.37.39

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.