1. Ubuntu Security Notices
  2. USN-8636-1

USN-8636-1: Linux kernel vulnerabilities

Publication date

12 August 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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:

  • x86 architecture;
  • InfiniBand drivers;
  • Media drivers;
  • Network drivers;
  • Mellanox network drivers;
  • Texas Instruments network drivers;
  • NVME drivers;
  • File systems infrastructure;
  • SMB network file system;
  • IPv4 networking;
  • Network traffic control;
  • TCP network protocol;
  • Locking primitives;
  • Memory management;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • RxRPC session sockets;
  • SCTP protocol;
  • SMC sockets

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;
  • InfiniBand drivers;
  • Media drivers;
  • Network drivers;
  • Mellanox network drivers;
  • Texas Instruments network drivers;
  • NVME drivers;
  • File systems infrastructure;
  • SMB network file system;
  • IPv4 networking;
  • Network traffic control;
  • TCP network protocol;
  • Locking primitives;
  • Memory management;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • RxRPC session sockets;
  • 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
24.04 LTS noble linux-image-6.17.0-1019-realtime –  6.17.0-1019.22  
linux-image-6.17.0-1022-azure –  6.17.0-1022.22
linux-image-6.17.0-1022-gcp –  6.17.0-1022.25
linux-image-6.17.0-1022-gcp-64k –  6.17.0-1022.25
linux-image-6.17.0-1032-oem –  6.17.0-1032.32
linux-image-6.17.0-42-generic –  6.17.0-42.42+1
linux-image-6.17.0-42-generic-64k –  6.17.0-42.42+1
linux-image-azure –  6.17.0-1022.22
linux-image-azure-6.17 –  6.17.0-1022.22
linux-image-gcp –  6.17.0-1022.25
linux-image-gcp-6.17 –  6.17.0-1022.25
linux-image-gcp-64k –  6.17.0-1022.25
linux-image-gcp-64k-6.17 –  6.17.0-1022.25
linux-image-generic-6.17 –  6.17.0-42.42
linux-image-generic-64k-6.17 –  6.17.0-42.42
linux-image-oem-24.04 –  6.17.0-1032.32
linux-image-oem-24.04a –  6.17.0-1032.32
linux-image-oem-24.04b –  6.17.0-1032.32
linux-image-oem-24.04c –  6.17.0-1032.32
linux-image-oem-24.04d –  6.17.0-1032.32
linux-image-oem-6.17 –  6.17.0-1032.32
linux-image-realtime-6.17 –  6.17.0-1019.22  
linux-image-realtime-hwe-24.04 –  6.17.0-1019.22  
linux-image-virtual-6.17 –  6.17.0-42.42

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References

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