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[USN-9027-2] Linux kernel (FIPS) vulnerabilities

Posted on 13 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9027-2
November 13, 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:

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;
- Hardware monitoring drivers;
- OCFS2 file system;
- IPv4 networking;
- Ethernet bridge;
- Netfilter;
- XFRM subsystem;
(CVE-2025-21656, CVE-2026-63940, CVE-2026-74350, CVE-2026-98432,
CVE-2026-99999)

Update instructions:

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

Ubuntu 22.04 LTS
linux-image-5.15.0-203-fips 5.15.0-203.213+fips1
Available with Ubuntu Pro
linux-image-fips 5.15.0.203.117
Available with Ubuntu Pro
linux-image-fips-5.15 5.15.0.203.117
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-9027-2
https://ubuntu.com/security/notices/USN-9027-1
CVE-2025-21656, CVE-2026-63940, CVE-2026-74350, CVE-2026-98432,
CVE-2026-99999

Package Information:
https://launchpad.net/ubuntu/+source/linux-fips/5.15.0-203.213+fips1

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