Ubuntu 18.04 LTS: USN-6029-1 Critical Denial Of Service Threats

ubuntu

April 19, 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-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-dell300x: Linux kernel for Dell 300x platforms

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

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

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

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

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

Details:

It was discovered that the Traffic-Control Index (TCINDEX) implementation

in the Linux kernel contained a use-after-free vulnerability. A local

attacker could use this to cause a denial of service ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical ubuntu linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1063-dell300x  4.15.0-1063.68
   linux-image-4.15.0-1117-oracle  4.15.0-1117.128
   linux-image-4.15.0-1130-raspi2  4.15.0-1130.138
   linux-image-4.15.0-1138-kvm     4.15.0-1138.143
   linux-image-4.15.0-1148-gcp     4.15.0-1148.164
   linux-image-4.15.0-1154-aws     4.15.0-1154.167
   linux-image-4.15.0-1163-azure   4.15.0-1163.178
   linux-image-4.15.0-209-generic  4.15.0-209.220
   linux-image-4.15.0-209-generic-lpae  4.15.0-209.220
   linux-image-4.15.0-209-lowlatency  4.15.0-209.220
   linux-image-aws-lts-18.04       4.15.0.1154.152
   linux-image-azure-lts-18.04     4.15.0.1163.131
   linux-image-dell300x            4.15.0.1063.62
   linux-image-gcp-lts-18.04       4.15.0.1148.162
   linux-image-generic             4.15.0.209.192
   linux-image-generic-lpae        4.15.0.209.192
   linux-image-kvm                 4.15.0.1138.129
   linux-image-lowlatency          4.15.0.209.192
   linux-image-oracle-lts-18.04    4.15.0.1117.122
   linux-image-raspi2              4.15.0.1130.125
   linux-image-virtual             4.15.0.209.192

Ubuntu 16.04 ESM:
   linux-image-4.15.0-1117-oracle  4.15.0-1117.128~16.04.1
   linux-image-4.15.0-1148-gcp     4.15.0-1148.164~16.04.1
   linux-image-4.15.0-1154-aws     4.15.0-1154.167~16.04.1
   linux-image-4.15.0-1163-azure   4.15.0-1163.178~16.04.1
   linux-image-4.15.0-209-generic  4.15.0-209.220~16.04.1
   linux-image-4.15.0-209-lowlatency  4.15.0-209.220~16.04.1
   linux-image-aws-hwe             4.15.0.1154.137
   linux-image-azure               4.15.0.1163.147
   linux-image-gcp                 4.15.0.1148.138
   linux-image-generic-hwe-16.04   4.15.0.209.194
   linux-image-gke                 4.15.0.1148.138
   linux-image-lowlatency-hwe-16.04  4.15.0.209.194
   linux-image-oem                 4.15.0.209.194
   linux-image-oracle              4.15.0.1117.98
   linux-image-virtual-hwe-16.04   4.15.0.209.194

Ubuntu 14.04 ESM:
   linux-image-4.15.0-1163-azure   4.15.0-1163.178~14.04.1
   linux-image-azure               4.15.0.1163.129

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.