Ubuntu 18.04 LTS USN-5560-1 Critical: Kernel Denial Of Service Risk

ubuntu

August 10, 2022

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-snapdragon: Linux kernel for Qualcomm Snapdragon processors

Details:

Zhenpeng Lin discovered that the network packet scheduler implementation in

the Linux kernel did not properly remove all references to a route filter

before freeing it in some situations. A local attacker could use this to

cause a denial of service (system crash) or execute arbitrary code.

(CVE-2022-2588)

It was discovered that the netfilter subsystem of the Linux kernel did n...

Read the Full Advisory

Topics Covered

security advisory Ubuntu critical update kernel local attack system crash Denial Of Service

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1051-dell300x  4.15.0-1051.56
   linux-image-4.15.0-1104-oracle  4.15.0-1104.115
   linux-image-4.15.0-1117-raspi2  4.15.0-1117.125
   linux-image-4.15.0-1125-kvm     4.15.0-1125.130
   linux-image-4.15.0-1134-gcp     4.15.0-1134.150
   linux-image-4.15.0-1135-snapdragon  4.15.0-1135.145
   linux-image-4.15.0-1139-aws     4.15.0-1139.150
   linux-image-4.15.0-1149-azure   4.15.0-1149.164
   linux-image-4.15.0-191-generic  4.15.0-191.202
   linux-image-4.15.0-191-generic-lpae  4.15.0-191.202
   linux-image-4.15.0-191-lowlatency  4.15.0-191.202
   linux-image-aws-lts-18.04       4.15.0.1139.139
   linux-image-azure-lts-18.04     4.15.0.1149.119
   linux-image-dell300x            4.15.0.1051.51
   linux-image-gcp-lts-18.04       4.15.0.1134.150
   linux-image-generic             4.15.0.191.176
   linux-image-generic-lpae        4.15.0.191.176
   linux-image-kvm                 4.15.0.1125.118
   linux-image-lowlatency          4.15.0.191.176
   linux-image-oracle-lts-18.04    4.15.0.1104.111
   linux-image-raspi2              4.15.0.1117.114
   linux-image-snapdragon          4.15.0.1135.136
   linux-image-virtual             4.15.0.191.176

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.