Ubuntu 20.04/18.04 LTS USN-6284-1 Critical Denial of Service Threats

ubuntu

August 11, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-iot: Linux kernel for IoT platforms

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the netlink implementation in the Linux kernel did

not properly validate policies when parsing attributes in some situations.

An attacker could use this to cause a denial of service (infi...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel update Ubuntu critical fix

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1019-iot      5.4.0-1019.20
   linux-image-5.4.0-1074-gkeop    5.4.0-1074.78
   linux-image-5.4.0-1091-raspi    5.4.0-1091.102
   linux-image-5.4.0-1096-kvm      5.4.0-1096.102
   linux-image-5.4.0-1106-oracle   5.4.0-1106.115
   linux-image-5.4.0-1107-aws      5.4.0-1107.115
   linux-image-5.4.0-1110-gcp      5.4.0-1110.119
   linux-image-5.4.0-156-generic   5.4.0-156.173
   linux-image-5.4.0-156-generic-lpae  5.4.0-156.173
   linux-image-5.4.0-156-lowlatency  5.4.0-156.173
   linux-image-aws-lts-20.04       5.4.0.1107.104
   linux-image-gcp-lts-20.04       5.4.0.1110.112
   linux-image-generic             5.4.0.156.152
   linux-image-generic-lpae        5.4.0.156.152
   linux-image-gkeop               5.4.0.1074.72
   linux-image-gkeop-5.4           5.4.0.1074.72
   linux-image-kvm                 5.4.0.1096.91
   linux-image-lowlatency          5.4.0.156.152
   linux-image-oem                 5.4.0.156.152
   linux-image-oem-osp1            5.4.0.156.152
   linux-image-oracle-lts-20.04    5.4.0.1106.99
   linux-image-raspi               5.4.0.1091.121
   linux-image-raspi2              5.4.0.1091.121
   linux-image-virtual             5.4.0.156.152

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1091-raspi    5.4.0-1091.102~18.04.1
   linux-image-5.4.0-1106-oracle   5.4.0-1106.115~18.04.1
   linux-image-5.4.0-1107-aws      5.4.0-1107.115~18.04.1
   linux-image-5.4.0-1110-gcp      5.4.0-1110.119~18.04.1
   linux-image-aws                 5.4.0.1107.85
   linux-image-gcp                 5.4.0.1110.86
   linux-image-oracle              5.4.0.1106.115~18.04.78
   linux-image-raspi-hwe-18.04     5.4.0.1091.88

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.