[USN-7987-2] Linux kernel (FIPS) vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-7987-2
January 29, 2026

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

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

- Ubuntu 16.04 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:
   - InfiniBand drivers;
   - Media drivers;
   - File systems infrastructure;
   - Timer subsystem;
   - Packet sockets;
   - Network traffic control;
(CVE-2021-47485, CVE-2024-49959, CVE-2024-50195, CVE-2024-53164,
CVE-2024-56606, CVE-2025-39993)

Update instructions:

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

Ubuntu 16.04 LTS
   linux-image-4.4.0-1121-fips     4.4.0-1121.128
                                   Available with Ubuntu Pro
   linux-image-fips                4.4.0.1121.122
                                   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-7987-2
   https://ubuntu.com/security/notices/USN-7987-1
   CVE-2021-47485, CVE-2024-49959, CVE-2024-50195, CVE-2024-53164,
   CVE-2024-56606, CVE-2025-39993

Package Information:
   https://launchpad.net/ubuntu/+source/linux-fips/4.4.0-1121.128

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