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[USN-8661-5] Linux kernel (Raspberry Pi) vulnerabilities

Posted on 22 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8661-5
September 22, 2026

linux-raspi 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-raspi: Linux kernel for Raspberry Pi systems

Details:

Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef discovered that the WiFi
implementation in the Linux kernel did not properly handle aggregated
frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A
physically proximate attacker could use this issue to inject packets.
(CVE-2025-27558)

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;
- InfiniBand drivers;
- Network drivers;
- NVME drivers;
- Ext4 file system;
- SMB network file system;
- IPv4 networking;
- Network traffic control;
- TCP network protocol;
- Locking primitives;
- IPv6 networking;
- Multipath TCP;
- Netfilter;
- Open vSwitch;
- SCTP protocol;
- SMC sockets;
(CVE-2026-31414, CVE-2026-31448, CVE-2026-31705, CVE-2026-43198,
CVE-2026-43378, CVE-2026-43499, CVE-2026-46266, CVE-2026-46331,
CVE-2026-52924, CVE-2026-52989, CVE-2026-53086, CVE-2026-53176,
CVE-2026-53212, CVE-2026-53215, CVE-2026-53224, CVE-2026-53225,
CVE-2026-53228, CVE-2026-53246, CVE-2026-53359, CVE-2026-64531)

Update instructions:

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

Ubuntu 22.04 LTS
linux-image-5.15.0-1108-raspi 5.15.0-1108.111
linux-image-raspi 5.15.0.1108.106
linux-image-raspi-5.15 5.15.0.1108.106
linux-image-raspi-nolpae 5.15.0.1108.106

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-8661-5
https://ubuntu.com/security/notices/USN-8661-4
https://ubuntu.com/security/notices/USN-8661-3
https://ubuntu.com/security/notices/USN-8661-2
https://ubuntu.com/security/notices/USN-8661-1
CVE-2025-27558, CVE-2026-31414, CVE-2026-31448, CVE-2026-31705,
CVE-2026-43198, CVE-2026-43378, CVE-2026-43499, CVE-2026-46266,
CVE-2026-46331, CVE-2026-52924, CVE-2026-52989, CVE-2026-53086,
CVE-2026-53176, CVE-2026-53212, CVE-2026-53215, CVE-2026-53224,
CVE-2026-53225, CVE-2026-53228, CVE-2026-53246, CVE-2026-53359,
CVE-2026-64531

Package Information:
https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1108.111

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