Ubuntu 18.04 LTS USN-5466-1 Critical: Kernel Security Threats

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-4.15: Linux kernel for Microsoft Azure Cloud 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-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:

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 discover...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel update critical ubuntu linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1098-oracle  4.15.0-1098.108
  linux-image-4.15.0-1114-raspi2  4.15.0-1114.122
  linux-image-4.15.0-1119-kvm     4.15.0-1119.123
  linux-image-4.15.0-1132-snapdragon  4.15.0-1132.142
  linux-image-4.15.0-1133-aws     4.15.0-1133.143
  linux-image-4.15.0-1142-azure   4.15.0-1142.156
  linux-image-4.15.0-184-generic  4.15.0-184.194
  linux-image-4.15.0-184-generic-lpae  4.15.0-184.194
  linux-image-4.15.0-184-lowlatency  4.15.0-184.194
  linux-image-aws-lts-18.04       4.15.0.1133.135
  linux-image-azure-lts-18.04     4.15.0.1142.114
  linux-image-generic             4.15.0.184.172
  linux-image-generic-lpae        4.15.0.184.172
  linux-image-kvm                 4.15.0.1119.114
  linux-image-lowlatency          4.15.0.184.172
  linux-image-oracle-lts-18.04    4.15.0.1098.107
  linux-image-raspi2              4.15.0.1114.111
  linux-image-snapdragon          4.15.0.1132.133
  linux-image-virtual             4.15.0.184.172

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1098-oracle  4.15.0-1098.108~16.04.1
  linux-image-4.15.0-1127-gcp     4.15.0-1127.142~16.04.1
  linux-image-4.15.0-1133-aws-hwe  4.15.0-1133.143~16.04.1
  linux-image-4.15.0-1142-azure   4.15.0-1142.156~16.04.1
  linux-image-4.15.0-184-generic  4.15.0-184.194~16.04.1
  linux-image-4.15.0-184-lowlatency  4.15.0-184.194~16.04.1
  linux-image-aws-hwe             4.15.0.1133.122
  linux-image-azure               4.15.0.1142.131
  linux-image-gcp                 4.15.0.1127.126
  linux-image-generic-hwe-16.04   4.15.0.184.173
  linux-image-gke                 4.15.0.1127.126
  linux-image-lowlatency-hwe-16.04  4.15.0.184.173
  linux-image-oem                 4.15.0.184.173
  linux-image-oracle              4.15.0.1098.85
  linux-image-virtual-hwe-16.04   4.15.0.184.173

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1142-azure   4.15.0-1142.156~14.04.1
  linux-image-azure               4.15.0.1142.113

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.