[USN-8661-3] Linux kernel vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-8661-3
August 27, 2026

linux-fips, linux-gke 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
- linux-gke: Linux kernel for Google Container Engine (GKE) 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-5.15.0-1110-gke     5.15.0-1110.116
   linux-image-5.15.0-190-fips     5.15.0-190.200+fips1
                                   Available with Ubuntu Pro
   linux-image-fips                5.15.0.190.111
                                   Available with Ubuntu Pro
   linux-image-fips-5.15           5.15.0.190.111
                                   Available with Ubuntu Pro
   linux-image-gke                 5.15.0.1110.109
   linux-image-gke-5.15            5.15.0.1110.109

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-8661-3
   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-fips/5.15.0-190.200+fips1
   https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1110.116

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 495 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20260827/6c5f995b/attachment.sig>