1. Ubuntu Security Notices
  2. USN-7796-1

USN-7796-1: Linux kernel vulnerabilities

Publication date

2 October 2025

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-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-oracle - Linux kernel for Oracle Cloud systems

Details

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:

  • Framebuffer layer;
  • BTRFS file system;
  • Ext4 file system;
  • Network file system (NFS) server daemon;
  • Packet sockets;
  • Network traffic control;
  • VMware vSockets driver

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:

  • Framebuffer layer;
  • BTRFS file system;
  • Ext4 file system;
  • Network file system (NFS) server daemon;
  • Packet sockets;
  • Network traffic control;
  • VMware vSockets 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
18.04 LTS bionic linux-image-4.15.0-1147-oracle –  4.15.0-1147.158  
linux-image-4.15.0-1178-gcp –  4.15.0-1178.195  
linux-image-4.15.0-1185-aws –  4.15.0-1185.198  
linux-image-4.15.0-1193-azure –  4.15.0-1193.208  
linux-image-4.15.0-242-generic –  4.15.0-242.254  
linux-image-4.15.0-242-lowlatency –  4.15.0-242.254  
linux-image-aws-4.15 –  4.15.0.1185.183  
linux-image-aws-lts-18.04 –  4.15.0.1185.183  
linux-image-azure-4.15 –  4.15.0.1193.161  
linux-image-azure-lts-18.04 –  4.15.0.1193.161  
linux-image-gcp-4.15 –  4.15.0.1178.191  
linux-image-gcp-lts-18.04 –  4.15.0.1178.191  
linux-image-generic –  4.15.0.242.226  
linux-image-lowlatency –  4.15.0.242.226  
linux-image-oracle-4.15 –  4.15.0.1147.152  
linux-image-oracle-lts-18.04 –  4.15.0.1147.152  
linux-image-virtual –  4.15.0.242.226  
16.04 LTS xenial linux-image-4.15.0-1178-gcp –  4.15.0-1178.195~16.04.1  
linux-image-4.15.0-1185-aws –  4.15.0-1185.198~16.04.1  
linux-image-4.15.0-1193-azure –  4.15.0-1193.208~16.04.1  
linux-image-4.15.0-242-generic –  4.15.0-242.254~16.04.1  
linux-image-4.15.0-242-lowlatency –  4.15.0-242.254~16.04.1  
linux-image-aws-hwe –  4.15.0.1185.198~16.04.1  
linux-image-azure –  4.15.0.1193.208~16.04.1  
linux-image-gcp –  4.15.0.1178.195~16.04.1  
linux-image-generic-hwe-16.04 –  4.15.0.242.254~16.04.1  
linux-image-gke –  4.15.0.1178.195~16.04.1  
linux-image-lowlatency-hwe-16.04 –  4.15.0.242.254~16.04.1  
linux-image-oem –  4.15.0.242.254~16.04.1  
linux-image-virtual-hwe-16.04 –  4.15.0.242.254~16.04.1  

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References

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