1. Ubuntu Security Notices
  2. USN-8818-6

USN-8818-6: Linux kernel (FIPS) vulnerabilities

Publication date

2 October 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)

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;
  • InfiniBand drivers;
  • Network drivers;
  • TCM subsystem;
  • exFAT file system;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • B.A.T.M.A.N. meshing protocol;
  • IPv4 networking;
  • IPv6 networking;
  • Netfilter;
  • RDS...

It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)

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;
  • InfiniBand drivers;
  • Network drivers;
  • TCM subsystem;
  • exFAT file system;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • B.A.T.M.A.N. meshing protocol;
  • IPv4 networking;
  • IPv6 networking;
  • Netfilter;
  • RDS 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
22.04 LTS jammy linux-image-5.15.0-194-fips –  5.15.0-194.204+fips1  
linux-image-fips –  5.15.0.194.113  
linux-image-fips-5.15 –  5.15.0.194.113  

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References

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