Ubuntu 21.10: USN-5135-1 Critical Denial of Service Threat

ubuntu

November 8, 2021

The system could be made to crash under certain conditions.

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).

Topics Covered

security advisory denial of service critical kernel ubuntu memory exhaustion linux update

Update Instructions

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

Ubuntu 21.10:
  linux-image-5.13.0-1005-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.