1. Ubuntu Security Notices
  2. USN-9033-1

USN-9033-1: Linux kernel vulnerabilities

Publication date

10 November 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

Demi Marie Obenour and Simon Gaiser discovered that several Xen para-
virtualization device frontends did not properly restrict the access rights
of device backends. An attacker could possibly use a malicious Xen backend
to gain access to memory pages of a guest VM or cause a denial of service
in the guest. (CVE-2022-23036, CVE-2022-23037)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • GPU drivers;
  • IIO ADC drivers;
  • Multiple devices driver;
  • Ethernet bonding driver;
  • Network drivers;
  • PCI subsystem;
  • VFIO drivers;
  • File systems infrastructure;
  • F2FS file system;
  • JFS file system;
  • Network file system (NFS) server daemon;
  • OCFS2 file...

Demi Marie Obenour and Simon Gaiser discovered that several Xen para-
virtualization device frontends did not properly restrict the access rights
of device backends. An attacker could possibly use a malicious Xen backend
to gain access to memory pages of a guest VM or cause a denial of service
in the guest. (CVE-2022-23036, CVE-2022-23037)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • GPU drivers;
  • IIO ADC drivers;
  • Multiple devices driver;
  • Ethernet bonding driver;
  • Network drivers;
  • PCI subsystem;
  • VFIO drivers;
  • File systems infrastructure;
  • F2FS file system;
  • JFS file system;
  • Network file system (NFS) server daemon;
  • OCFS2 file system;
  • Overlay file system;
  • Tracing infrastructure;
  • IUCV driver

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 LTS xenial linux-image-4.4.0-1163-kvm –  4.4.0-1163.174  
linux-image-4.4.0-1200-aws –  4.4.0-1200.215  
linux-image-4.4.0-291-generic –  4.4.0-291.325  
linux-image-4.4.0-291-lowlatency –  4.4.0-291.325  
linux-image-aws –  4.4.0.1200.204  
linux-image-generic –  4.4.0.291.297  
linux-image-generic-lts-xenial –  4.4.0.291.297  
linux-image-kvm –  4.4.0.1163.160  
linux-image-lowlatency –  4.4.0.291.297  
linux-image-lowlatency-lts-xenial –  4.4.0.291.297  
linux-image-virtual –  4.4.0.291.297  
linux-image-virtual-lts-xenial –  4.4.0.291.297  
14.04 LTS trusty linux-image-4.4.0-291-generic –  4.4.0-291.325~14.04.1  
linux-image-4.4.0-291-lowlatency –  4.4.0-291.325~14.04.1  
linux-image-generic-lts-xenial –  4.4.0.291.325~14.04.1  
linux-image-lowlatency-lts-xenial –  4.4.0.291.325~14.04.1  
linux-image-virtual-lts-xenial –  4.4.0.291.325~14.04.1  

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References

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