1. Ubuntu Security Notices
  2. USN-8633-1

USN-8633-1: Linux kernel vulnerabilities

Publication date

12 August 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-aws-fips - Linux kernel for Amazon Web Services (AWS) systems with FIPS
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-fips - Linux kernel for Microsoft Azure Cloud systems with FIPS
  • linux-fips - Linux kernel with FIPS
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-fips - Linux kernel for Google Cloud Platform (GCP) systems with FIPS
  • linux-kvm - Linux kernel for cloud environments

Details

Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef discovered that the WiFi
implementation in the Linux kernel did not properly handle aggregated
frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A
physically proximate attacker could use this issue to inject packets.
(CVE-2025-27558)

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:

  • x86 architecture;
  • Cryptographic API;
  • GPU drivers;
  • InfiniBand drivers;
  • Media drivers;
  • NVIDIA Tegra memory controller driver;
  • Network drivers;
  • STMicroelectronics network drivers;
  • NVME drivers;
  • Ext4 file system;
  • IPv4 networking;
  • Network traffic control;
  • TCP network...

Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef discovered that the WiFi
implementation in the Linux kernel did not properly handle aggregated
frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A
physically proximate attacker could use this issue to inject packets.
(CVE-2025-27558)

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:

  • x86 architecture;
  • Cryptographic API;
  • GPU drivers;
  • InfiniBand drivers;
  • Media drivers;
  • NVIDIA Tegra memory controller driver;
  • Network drivers;
  • STMicroelectronics network drivers;
  • NVME drivers;
  • Ext4 file system;
  • IPv4 networking;
  • Network traffic control;
  • TCP network protocol;
  • Locking primitives;
  • B.A.T.M.A.N. meshing protocol;
  • Ceph Core library;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • SCTP protocol;
  • SMC 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
18.04 LTS bionic linux-image-4.15.0-1150-fips –  4.15.0-1150.162  
linux-image-4.15.0-1177-kvm –  4.15.0-1177.182  
linux-image-4.15.0-1188-gcp –  4.15.0-1188.205  
linux-image-4.15.0-1195-aws –  4.15.0-1195.208  
linux-image-4.15.0-1205-azure –  4.15.0-1205.220  
linux-image-4.15.0-2096-gcp-fips –  4.15.0-2096.102  
linux-image-4.15.0-2113-azure-fips –  4.15.0-2113.119  
linux-image-4.15.0-2133-aws-fips –  4.15.0-2133.139  
linux-image-4.15.0-254-generic –  4.15.0-254.266  
linux-image-4.15.0-254-lowlatency –  4.15.0-254.266  
linux-image-aws-4.15 –  4.15.0.1195.193  
linux-image-aws-fips –  4.15.0.2133.127  
linux-image-aws-fips-4.15 –  4.15.0.2133.127  
linux-image-aws-lts-18.04 –  4.15.0.1195.193  
linux-image-azure-4.15 –  4.15.0.1205.173  
linux-image-azure-fips –  4.15.0.2113.109  
linux-image-azure-fips-4.15 –  4.15.0.2113.109  
linux-image-azure-lts-18.04 –  4.15.0.1205.173  
linux-image-fips –  4.15.0.1150.147  
linux-image-gcp-4.15 –  4.15.0.1188.201  
linux-image-gcp-fips –  4.15.0.2096.94  
linux-image-gcp-fips-4.15 –  4.15.0.2096.94  
linux-image-gcp-lts-18.04 –  4.15.0.1188.201  
linux-image-generic –  4.15.0.254.238  
linux-image-kvm –  4.15.0.1177.168  
linux-image-lowlatency –  4.15.0.254.238  
linux-image-virtual –  4.15.0.254.238  

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References

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