1. Ubuntu Security Notices
  2. USN-8392-1

USN-8392-1: Linux kernel vulnerabilities

Publication date

4 June 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)

It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500)

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...

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)

It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500)

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;
  • RDS protocol;
  • 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
18.04 LTS bionic linux-image-5.4.0-1160-aws –  5.4.0-1160.170~18.04.1  
linux-image-5.4.0-231-generic –  5.4.0-231.251~18.04.1  
linux-image-5.4.0-231-lowlatency –  5.4.0-231.251~18.04.1  
linux-image-aws –  5.4.0.1160.170~18.04.1  
linux-image-aws-5.4 –  5.4.0.1160.170~18.04.1  
linux-image-generic-5.4 –  5.4.0.231.251~18.04.1  
linux-image-generic-hwe-18.04 –  5.4.0.231.251~18.04.1  
linux-image-lowlatency-5.4 –  5.4.0.231.251~18.04.1  
linux-image-lowlatency-hwe-18.04 –  5.4.0.231.251~18.04.1  
linux-image-oem –  5.4.0.231.251~18.04.1  
linux-image-oem-osp1 –  5.4.0.231.251~18.04.1  
linux-image-snapdragon-5.4 –  5.4.0.231.251~18.04.1  
linux-image-snapdragon-hwe-18.04 –  5.4.0.231.251~18.04.1  
linux-image-virtual-5.4 –  5.4.0.231.251~18.04.1  
linux-image-virtual-hwe-18.04 –  5.4.0.231.251~18.04.1  

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References

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