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[USN-8715-2] Linux kernel (AWS FIPS) vulnerabilities

Posted on 18 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8715-2
September 18, 2026

linux-aws-fips vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS

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;
- Cryptographic API;
- InfiniBand drivers;
- Media drivers;
- NVIDIA Tegra memory controller driver;
- Network drivers;
- NVME drivers;
- File systems infrastructure;
- Ext4 file system;
- OCFS2 file system;
- IPv4 networking;
- Network traffic control;
- TCP network protocol;
- Locking primitives;
- B.A.T.M.A.N. meshing protocol;
- Ceph Core library;
- IPv6 networking;
- Multipath TCP;
- Netfilter;
- SCTP protocol;
- SMC sockets;
- TIPC protocol;
(CVE-2021-47378, CVE-2026-23392, CVE-2026-31405, CVE-2026-31414,
CVE-2026-31448, CVE-2026-31657, CVE-2026-31668, CVE-2026-43071,
CVE-2026-43198, CVE-2026-43493, CVE-2026-43499, CVE-2026-46266,
CVE-2026-46331, CVE-2026-52914, CVE-2026-52924, CVE-2026-52931,
CVE-2026-52955, CVE-2026-52958, CVE-2026-52982, CVE-2026-52986,
CVE-2026-52989, CVE-2026-52993, CVE-2026-52999, CVE-2026-53002,
CVE-2026-53006, CVE-2026-53043, CVE-2026-53045, CVE-2026-53088,
CVE-2026-53176, CVE-2026-53212, CVE-2026-53224, CVE-2026-53225,
CVE-2026-53228, CVE-2026-53246, CVE-2026-53309, CVE-2026-53359)

Update instructions:

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

Ubuntu 20.04 LTS
linux-image-5.4.0-1163-aws-fips 5.4.0-1163.174+fips1
Available with Ubuntu Pro
linux-image-aws-fips 5.4.0.1163.110
Available with Ubuntu Pro
linux-image-aws-fips-5.4 5.4.0.1163.110
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-8715-2
https://ubuntu.com/security/notices/USN-8715-1
CVE-2021-47378, CVE-2025-27558, CVE-2026-23392, CVE-2026-31405,
CVE-2026-31414, CVE-2026-31448, CVE-2026-31657, CVE-2026-31668,
CVE-2026-43071, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499,
CVE-2026-46266, CVE-2026-46331, CVE-2026-52914, CVE-2026-52924,
CVE-2026-52931, CVE-2026-52955, CVE-2026-52958, CVE-2026-52982,
CVE-2026-52986, CVE-2026-52989, CVE-2026-52993, CVE-2026-52999,
CVE-2026-53002, CVE-2026-53006, CVE-2026-53043, CVE-2026-53045,
CVE-2026-53088, CVE-2026-53176, CVE-2026-53212, CVE-2026-53224,
CVE-2026-53225, CVE-2026-53228, CVE-2026-53246, CVE-2026-53309,
CVE-2026-53359

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws-fips/5.4.0-1163.174+fips1

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