Ubuntu alert USN-8818-6 (linux-fips)

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[USN-8818-6] Linux kernel (FIPS) vulnerabilities
Date:
             
 
Fri, 02 Oct 2026 07:43:34 +0000
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<E1xCXva-00011T-4a@lists.ubuntu.com>
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noreply+usn-bot@canonical.com
==========================================================================
Ubuntu Security Notice USN-8818-6
October 02, 2026

linux-fips vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-fips: Linux kernel with FIPS

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so had been revoked, bypassing memory protections or escalating privileges.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 protocol;
(CVE-2026-53186, CVE-2026-53216, CVE-2026-53221, CVE-2026-53354,
CVE-2026-53355, CVE-2026-53398, CVE-2026-63800, CVE-2026-63808,
CVE-2026-63887, CVE-2026-63888, CVE-2026-63912, CVE-2026-63922,
CVE-2026-63924, CVE-2026-63984, CVE-2026-63992, CVE-2026-63993,
CVE-2026-63994, CVE-2026-64007, CVE-2026-64091)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS
  linux-image-5.15.0-194-fips     5.15.0-194.204+fips1
                                  Available with Ubuntu Pro
  linux-image-fips                5.15.0.194.113
                                  Available with Ubuntu Pro
  linux-image-fips-5.15           5.15.0.194.113
                                  Available with Ubuntu Pro

After a standard system update you need to reboot your computer to make
all the necessary changes.

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.

References:
  https://ubuntu.com/security/notices/USN-8818-6
  https://ubuntu.com/security/notices/USN-8818-5
  https://ubuntu.com/security/notices/USN-8818-4
  https://ubuntu.com/security/notices/USN-8818-3
  https://ubuntu.com/security/notices/USN-8818-2
  https://ubuntu.com/security/notices/USN-8818-1
  CVE-2025-10263, CVE-2026-53186, CVE-2026-53216, CVE-2026-53221,
  CVE-2026-53354, CVE-2026-53355, CVE-2026-53398, CVE-2026-63800,
  CVE-2026-63808, CVE-2026-63887, CVE-2026-63888, CVE-2026-63912,
  CVE-2026-63922, CVE-2026-63924, CVE-2026-63984, CVE-2026-63992,
  CVE-2026-63993, CVE-2026-63994, CVE-2026-64007, CVE-2026-64091

Package Information:
  https://launchpad.net/ubuntu/+source/linux-fips/5.15.0-19...


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