Ubuntu 20.04 LTS USN-5980-1 Moderate: Kernel Memory Exhaustion DoS

ubuntu

March 28, 2023

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

- linux-ibm: Linux kernel for IBM cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the System V IPC implementation in the Linux kernel

did not properly handle large shared memory counts. A local attacker could

use this to cause a denial of service (memory exhaustion). (CVE-2021-3669)

It was discovered that the KVM VMX implementation in the Linux kernel did

not properly handle indirect...

Read the Full Advisory

Topics Covered

security advisory kernel update Ubuntu moderate severity DoS threat memory exhaustion

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1046-ibm      5.4.0-1046.51
   linux-image-5.4.0-1066-gkeop    5.4.0-1066.70
   linux-image-5.4.0-1082-raspi    5.4.0-1082.93
   linux-image-5.4.0-1088-kvm      5.4.0-1088.94
   linux-image-5.4.0-1096-gke      5.4.0-1096.103
   linux-image-5.4.0-1098-oracle   5.4.0-1098.107
   linux-image-5.4.0-1099-aws      5.4.0-1099.107
   linux-image-5.4.0-1102-gcp      5.4.0-1102.111
   linux-image-5.4.0-1105-azure    5.4.0-1105.111
   linux-image-5.4.0-146-generic   5.4.0-146.163
   linux-image-5.4.0-146-generic-lpae  5.4.0-146.163
   linux-image-5.4.0-146-lowlatency  5.4.0-146.163
   linux-image-aws-lts-20.04       5.4.0.1099.96
   linux-image-azure-lts-20.04     5.4.0.1105.98
   linux-image-gcp-lts-20.04       5.4.0.1102.104
   linux-image-generic             5.4.0.146.144
   linux-image-generic-lpae        5.4.0.146.144
   linux-image-gke                 5.4.0.1096.101
   linux-image-gke-5.4             5.4.0.1096.101
   linux-image-gkeop               5.4.0.1066.64
   linux-image-gkeop-5.4           5.4.0.1066.64
   linux-image-ibm                 5.4.0.1046.72
   linux-image-ibm-lts-20.04       5.4.0.1046.72
   linux-image-kvm                 5.4.0.1088.82
   linux-image-lowlatency          5.4.0.146.144
   linux-image-oem                 5.4.0.146.144
   linux-image-oem-osp1            5.4.0.146.144
   linux-image-oracle-lts-20.04    5.4.0.1098.91
   linux-image-raspi               5.4.0.1082.112
   linux-image-raspi2              5.4.0.1082.112
   linux-image-virtual             5.4.0.146.144

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.