[USN-7922-4] Linux kernel (Raspberry Pi) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7922-4
January 06, 2026

linux-raspi, linux-raspi-5.4 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

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:
- Cryptographic API;
- ACPI drivers;
- InfiniBand drivers;
- Media drivers;
- Network drivers;
- Pin controllers subsystem;
- AFS file system;
- F2FS file system;
- Tracing infrastructure;
- Memory management;
- Appletalk network protocol;
- Netfilter;
(CVE-2022-49026, CVE-2022-49390, CVE-2024-47691, CVE-2024-49935,
CVE-2024-50067, CVE-2024-50095, CVE-2024-50196, CVE-2024-53090,
CVE-2024-53218, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
CVE-2025-39964, CVE-2025-39993, CVE-2025-40018)

Update instructions:

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

Ubuntu 20.04 LTS
linux-image-5.4.0-1136-raspi 5.4.0-1136.149
Available with Ubuntu Pro
linux-image-raspi 5.4.0.1136.167
Available with Ubuntu Pro
linux-image-raspi-5.4 5.4.0.1136.167
Available with Ubuntu Pro
linux-image-raspi-hwe-18.04 5.4.0.1136.167
Available with Ubuntu Pro
linux-image-raspi2 5.4.0.1136.167
Available with Ubuntu Pro
linux-image-raspi2-hwe-18.04 5.4.0.1136.167
Available with Ubuntu Pro

Ubuntu 18.04 LTS
linux-image-5.4.0-1136-raspi 5.4.0-1136.149~18.04.1
Available with Ubuntu Pro
linux-image-raspi-5.4 5.4.0.1136.149~18.04.1
Available with Ubuntu Pro
linux-image-raspi-hwe-18.04 5.4.0.1136.149~18.04.1
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-7922-4
https://ubuntu.com/security/notices/USN-7922-3
https://ubuntu.com/security/notices/USN-7922-2
https://ubuntu.com/security/notices/USN-7922-1
CVE-2022-49026, CVE-2022-49390, CVE-2024-47691, CVE-2024-49935,
CVE-2024-50067, CVE-2024-50095, CVE-2024-50196, CVE-2024-53090,
CVE-2024-53218, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
CVE-2025-39964, CVE-2025-39993, CVE-2025-40018