Ubuntu 21.10: USN-5337-1 Critical Kernel Fixes for DoS Risks

ubuntu

March 22, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-aws-5.13: Linux kernel for Amazon Web Services (AWS) systems

- linux-hwe-5.13: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the BPF verifier in the Linux kernel did not

properly restrict pointer types in certain situations. A local attacker

could use this to cause a denial of service (system crash) or possibly

execute arbitrary code. (CVE-2022-23222)

Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the

Linux kernel did not properly restrict access to the cgroups v1

release_agent feature. A local attacker could use this to gain

administrative privileges. (CVE-2022-0492)

Jü...

Read the Full Advisory

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel system update

Update Instructions

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

Ubuntu 21.10:
  linux-image-5.13.0-1018-kvm     5.13.0-1018.19
  linux-image-5.13.0-1019-aws     5.13.0-1019.21
  linux-image-5.13.0-1021-gcp     5.13.0-1021.25
  linux-image-5.13.0-1022-raspi   5.13.0-1022.24
  linux-image-5.13.0-1022-raspi-nolpae  5.13.0-1022.24
  linux-image-5.13.0-37-generic   5.13.0-37.42
  linux-image-5.13.0-37-generic-64k  5.13.0-37.42
  linux-image-5.13.0-37-generic-lpae  5.13.0-37.42
  linux-image-5.13.0-37-lowlatency  5.13.0-37.42
  linux-image-aws                 5.13.0.1019.20
  linux-image-gcp                 5.13.0.1021.19
  linux-image-generic             5.13.0.37.46
  linux-image-generic-64k         5.13.0.37.46
  linux-image-generic-lpae        5.13.0.37.46
  linux-image-gke                 5.13.0.1021.19
  linux-image-kvm                 5.13.0.1018.18
  linux-image-lowlatency          5.13.0.37.46
  linux-image-oem-20.04           5.13.0.37.46
  linux-image-raspi               5.13.0.1022.27
  linux-image-raspi-nolpae        5.13.0.1022.27
  linux-image-virtual             5.13.0.37.46

Ubuntu 20.04 LTS:
  linux-image-5.13.0-1019-aws     5.13.0-1019.21~20.04.1
  linux-image-5.13.0-37-generic   5.13.0-37.42~20.04.1
  linux-image-5.13.0-37-generic-64k  5.13.0-37.42~20.04.1
  linux-image-5.13.0-37-generic-lpae  5.13.0-37.42~20.04.1
  linux-image-5.13.0-37-lowlatency  5.13.0-37.42~20.04.1
  linux-image-aws                 5.13.0.1019.21~20.04.12
  linux-image-generic-64k-hwe-20.04  5.13.0.37.42~20.04.22
  linux-image-generic-hwe-20.04   5.13.0.37.42~20.04.22
  linux-image-generic-lpae-hwe-20.04  5.13.0.37.42~20.04.22
  linux-image-lowlatency-hwe-20.04  5.13.0.37.42~20.04.22
  linux-image-virtual-hwe-20.04   5.13.0.37.42~20.04.22

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.