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

USN-8818-2: Linux kernel (IBM) vulnerabilities

Publication date

25 September 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so had been revoked, bypassing memory protections or escalating privileges.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so had been revoked, bypassing memory protections or escalating privileges.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
20.04 LTS focal linux-image-5.15.0-1110-ibm –  5.15.0-1110.114~20.04.1  
linux-image-ibm –  5.15.0.1110.114~20.04.1  
linux-image-ibm-5.15 –  5.15.0.1110.114~20.04.1  

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References

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