==========================================================================
Ubuntu Security Notice USN-5135-1
November 09, 2021

linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11,
linux-gcp, linux-gcp-5.11, linux-hwe-5.11, linux-kvm, linux-oem-5.13,
linux-oracle, linux-oracle-5.11 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

The system could be made to crash under certain conditions.

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-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-5.11: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.11: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.11: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.11: Linux hardware enablement (HWE) kernel
- linux-oem-5.13: Linux kernel for OEM systems
- linux-oracle-5.11: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the Linux kernel did not properly account for the
memory usage of certain IPC objects. A local attacker could use this to
cause a denial of service (memory exhaustion).

Update instructions:

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

Ubuntu 21.10:
  linux-image-5.13.0-1005-kvm     5.13.0-1005.5
  linux-image-5.13.0-1006-aws     5.13.0-1006.7
  linux-image-5.13.0-1006-gcp     5.13.0-1006.7
  linux-image-5.13.0-1007-azure   5.13.0-1007.8
  linux-image-5.13.0-1009-oracle  5.13.0-1009.11
  linux-image-5.13.0-21-generic   5.13.0-21.21
  linux-image-5.13.0-21-generic-64k  5.13.0-21.21
  linux-image-5.13.0-21-generic-lpae  5.13.0-21.21
  linux-image-5.13.0-21-lowlatency  5.13.0-21.21
  linux-image-aws                 5.13.0.1006.8
  linux-image-azure               5.13.0.1007.8
  linux-image-gcp                 5.13.0.1006.7
  linux-image-generic             5.13.0.21.32
  linux-image-generic-64k         5.13.0.21.32
  linux-image-generic-lpae        5.13.0.21.32
  linux-image-gke                 5.13.0.1006.7
  linux-image-kvm                 5.13.0.1005.5
  linux-image-lowlatency          5.13.0.21.32
  linux-image-oem-20.04           5.13.0.21.32
  linux-image-oracle              5.13.0.1009.11
  linux-image-virtual             5.13.0.21.32

Ubuntu 21.04:
  linux-image-5.11.0-1019-kvm     5.11.0-1019.21
  linux-image-5.11.0-1021-aws     5.11.0-1021.22
  linux-image-5.11.0-1021-azure   5.11.0-1021.22
  linux-image-5.11.0-1021-oracle  5.11.0-1021.22
  linux-image-5.11.0-1022-gcp     5.11.0-1022.24
  linux-image-5.11.0-40-generic   5.11.0-40.44
  linux-image-5.11.0-40-generic-64k  5.11.0-40.44
  linux-image-5.11.0-40-generic-lpae  5.11.0-40.44
  linux-image-5.11.0-40-lowlatency  5.11.0-40.44
  linux-image-aws                 5.11.0.1021.22
  linux-image-azure               5.11.0.1021.22
  linux-image-gcp                 5.11.0.1022.22
  linux-image-generic             5.11.0.40.41
  linux-image-generic-64k         5.11.0.40.41
  linux-image-generic-lpae        5.11.0.40.41
  linux-image-gke                 5.11.0.1022.22
  linux-image-kvm                 5.11.0.1019.20
  linux-image-lowlatency          5.11.0.40.41
  linux-image-oem-20.04           5.11.0.40.41
  linux-image-oracle              5.11.0.1021.22
  linux-image-virtual             5.11.0.40.41

Ubuntu 20.04 LTS:
  linux-image-5.11.0-1021-aws     5.11.0-1021.22~20.04.2
  linux-image-5.11.0-1021-azure   5.11.0-1021.22~20.04.1
  linux-image-5.11.0-1021-oracle  5.11.0-1021.22~20.04.1
  linux-image-5.11.0-1022-gcp     5.11.0-1022.24~20.04.1
  linux-image-5.11.0-40-generic   5.11.0-40.44~20.04.2
  linux-image-5.11.0-40-generic-64k  5.11.0-40.44~20.04.2
  linux-image-5.11.0-40-generic-lpae  5.11.0-40.44~20.04.2
  linux-image-5.11.0-40-lowlatency  5.11.0-40.44~20.04.2
  linux-image-5.13.0-1019-oem     5.13.0-1019.23
  linux-image-aws                 5.11.0.1021.22~20.04.20
  linux-image-azure               5.11.0.1021.22~20.04.21
  linux-image-gcp                 5.11.0.1022.24~20.04.21
  linux-image-generic-64k-hwe-20.04  5.11.0.40.44~20.04.18
  linux-image-generic-hwe-20.04   5.11.0.40.44~20.04.18
  linux-image-generic-lpae-hwe-20.04  5.11.0.40.44~20.04.18
  linux-image-lowlatency-hwe-20.04  5.11.0.40.44~20.04.18
  linux-image-oem-20.04c          5.13.0.1019.23
  linux-image-oracle              5.11.0.1021.22~20.04.14
  linux-image-virtual-hwe-20.04   5.11.0.40.44~20.04.18

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.

References:
  https://ubuntu.com/security/notices/USN-5135-1
  CVE-2021-3759

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.13.0-21.21
  https://launchpad.net/ubuntu/+source/linux-aws/5.13.0-1006.7
  https://launchpad.net/ubuntu/+source/linux-azure/5.13.0-1007.8
  https://launchpad.net/ubuntu/+source/linux-gcp/5.13.0-1006.7
  https://launchpad.net/ubuntu/+source/linux-kvm/5.13.0-1005.5
  https://launchpad.net/ubuntu/+source/linux-oracle/5.13.0-1009.11
  https://launchpad.net/ubuntu/+source/linux/5.11.0-40.44
  https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1021.22
  https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1021.22
  https://launchpad.net/ubuntu/+source/linux-gcp/5.11.0-1022.24
  https://launchpad.net/ubuntu/+source/linux-kvm/5.11.0-1019.21
  https://launchpad.net/ubuntu/+source/linux-oracle/5.11.0-1021.22
  https://launchpad.net/ubuntu/+source/linux-aws-5.11/5.11.0-1021.22~20.04.2
  https://launchpad.net/ubuntu/+source/linux-azure-5.11/5.11.0-1021.22~20.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp-5.11/5.11.0-1022.24~20.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-40.44~20.04.2
  https://launchpad.net/ubuntu/+source/linux-oem-5.13/5.13.0-1019.23
  https://launchpad.net/ubuntu/+source/linux-oracle-5.11/5.11.0-1021.22~20.04.1