1. Ubuntu Security Notices
  2. USN-8280-2

USN-8280-2: Linux kernel (Azure)vulnerabilities

Publication date

22 May 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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;
  • TLS protocol

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;
  • TLS protocol

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
20.04 LTS focal linux-image-5.4.0-1163-azure –  5.4.0-1163.169  
linux-image-5.4.0-1163-azure-fips –  5.4.0-1163.169+fips1  
linux-image-azure-5.4 –  5.4.0.1163.155  
linux-image-azure-fips –  5.4.0.1163.99  
linux-image-azure-fips-5.4 –  5.4.0.1163.99  
linux-image-azure-lts-20.04 –  5.4.0.1163.155  
18.04 LTS bionic linux-image-5.4.0-1163-azure –  5.4.0-1163.169~18.04.1  
linux-image-azure –  5.4.0.1163.169~18.04.1  
linux-image-azure-5.4 –  5.4.0.1163.169~18.04.1  

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References

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