1. Ubuntu Security Notices
  2. USN-8441-1

USN-8441-1: Linux kernel vulnerabilities

Publication date

17 June 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • 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
  • linux-oracle - Linux kernel for Oracle Cloud systems

Details

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

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:

  • Cryptographic API;
  • Packet sockets

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

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:

  • Cryptographic API;
  • Packet sockets

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-4.15.0-1154-oracle –  4.15.0-1154.165~16.04.1  
linux-image-4.15.0-1185-gcp –  4.15.0-1185.202~16.04.1  
linux-image-4.15.0-1192-aws –  4.15.0-1192.205~16.04.1  
linux-image-4.15.0-1201-azure –  4.15.0-1201.216~16.04.1  
linux-image-4.15.0-250-generic –  4.15.0-250.262~16.04.1  
linux-image-4.15.0-250-lowlatency –  4.15.0-250.262~16.04.1  
linux-image-aws-hwe –  4.15.0.1192.205~16.04.1  
linux-image-azure –  4.15.0.1201.216~16.04.1  
linux-image-gcp –  4.15.0.1185.202~16.04.1  
linux-image-generic-hwe-16.04 –  4.15.0.250.262~16.04.1  
linux-image-gke –  4.15.0.1185.202~16.04.1  
linux-image-lowlatency-hwe-16.04 –  4.15.0.250.262~16.04.1  
linux-image-oem –  4.15.0.250.262~16.04.1  
linux-image-oracle –  4.15.0.1154.165~16.04.1  
linux-image-virtual-hwe-16.04 –  4.15.0.250.262~16.04.1  

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References

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