1. Ubuntu Security Notices
  2. USN-5579-1

USN-5579-1: Linux kernel vulnerabilities

Publication date

24 August 2022

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Roger Pau Monné discovered that the Xen virtual block driver in the Linux
kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-26365)

Roger Pau Monné discovered that the Xen paravirtualization frontend in the
Linux kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux
kernel incorrectly shared unrelated data when communicating with certain
backends. A local attacker could use this to cause a denial of service
(guest crash) or expose sensitive information (guest kernel memory).
(

Roger Pau Monné discovered that the Xen virtual block driver in the Linux
kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-26365)

Roger Pau Monné discovered that the Xen paravirtualization frontend in the
Linux kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux
kernel incorrectly shared unrelated data when communicating with certain
backends. A local attacker could use this to cause a denial of service
(guest crash) or expose sensitive information (guest kernel memory).
(CVE-2022-33741)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
16.04 xenial linux-image-4.4.0-233-lowlatency –  4.4.0-233.267  
linux-image-virtual –  4.4.0.233.239  
linux-image-generic –  4.4.0.233.239  
linux-image-4.4.0-233-generic –  4.4.0-233.267  
linux-image-4.4.0-1113-kvm –  4.4.0-1113.123  
linux-image-kvm –  4.4.0.1113.110  
linux-image-lowlatency –  4.4.0.233.239  
14.04 trusty linux-image-4.4.0-233-generic –  4.4.0-233.267~14.04.1  
linux-image-4.4.0-233-lowlatency –  4.4.0-233.267~14.04.1  
linux-image-generic-lts-xenial –  4.4.0.233.202  
linux-image-lowlatency-lts-xenial –  4.4.0.233.202  
linux-image-virtual-lts-xenial –  4.4.0.233.202  

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References

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