1. Ubuntu Security Notices
  2. USN-8490-1

USN-8490-1: Linux kernel vulnerabilities

Publication date

1 July 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:

  • ARM64 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • DMA engine subsystem;
  • InfiniBand drivers;
  • STMicroelectronics network drivers;
  • Network drivers;
  • NVME drivers;
  • SCSI subsystem;
  • USB over IP driver;
  • File systems infrastructure;
  • Ext4 file system;
  • Network file system (NFS) server daemon;
  • SMB network file system;
  • Kernel thread helper (kthread);
  • IPv6 networking;
  • Tracing infrastructure;
  • Kernel exit() syscall;
  • Scatterlist API;
  • B.A.T.M.A.N. meshing protocol;
  • Ethernet bridge;
  • Ceph Core library;
  • IPv4 networking;
  • Multipath TCP;
  • Netfilter;
  • RxRPC session...

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:

  • ARM64 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • DMA engine subsystem;
  • InfiniBand drivers;
  • STMicroelectronics network drivers;
  • Network drivers;
  • NVME drivers;
  • SCSI subsystem;
  • USB over IP driver;
  • File systems infrastructure;
  • Ext4 file system;
  • Network file system (NFS) server daemon;
  • SMB network file system;
  • Kernel thread helper (kthread);
  • IPv6 networking;
  • Tracing infrastructure;
  • Kernel exit() syscall;
  • Scatterlist API;
  • B.A.T.M.A.N. meshing protocol;
  • Ethernet bridge;
  • Ceph Core library;
  • IPv4 networking;
  • Multipath TCP;
  • Netfilter;
  • RxRPC session sockets;
  • SMC sockets;
  • X.25 network layer

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
25.10 questing linux-image-6.17.0-40-generic –  6.17.0-40.40
linux-image-6.17.0-40-generic-64k –  6.17.0-40.40
linux-image-generic –  6.17.0-40.40
linux-image-generic-6.17 –  6.17.0-40.40
linux-image-generic-64k –  6.17.0-40.40
linux-image-generic-64k-6.17 –  6.17.0-40.40
linux-image-oem-24.04 –  6.17.0-40.40
linux-image-oem-24.04c –  6.17.0-40.40
linux-image-virtual –  6.17.0-40.40
linux-image-virtual-6.17 –  6.17.0-40.40

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References

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