Ubuntu alert USN-8548-1 (linux-aws, linux-fips, linux-lts-xenial)

From:
             
 
Giampaolo Fresi Roglia via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8548-1] Linux kernel vulnerabilities
Date:
             
 
Wed, 15 Jul 2026 14:13:26 +0200
Message-ID:
             
 
<sa7qzl4jvrt.fsf@canonical.com>
Cc:
             
 
Giampaolo Fresi Roglia <giampaolo.fresi.roglia@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8548-1
July 15, 2026

linux-aws, linux-fips, linux-lts-xenial vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-fips: Linux kernel with FIPS
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503)

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:
  - SCSI subsystem;
  - Thermal drivers;
  - USB over IP driver;
  - File systems infrastructure;
  - Ext4 file system;
  - Network file system (NFS) server daemon;
  - SMB network file system;
  - Tracing infrastructure;
  - B.A.T.M.A.N. meshing protocol;
  - Ceph Core library;
  - DCCP (Datagram Congestion Control Protocol);
  - IPv4 networking;
  - IPv6 networking;
  - Netfilter;
  - RxRPC session sockets;
  - X.25 network layer;
(CVE-2021-47117, CVE-2021-47202, CVE-2023-52646, CVE-2024-56643,
CVE-2026-23455, CVE-2026-31402, CVE-2026-31607, CVE-2026-31637,
CVE-2026-31659, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,
CVE-2026-45988, CVE-2026-46119, CVE-2026-46243)

Update instructions:

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

Ubuntu 16.04 LTS
  linux-image-4.4.0-1126-fips     4.4.0-1126.133
                                  Available with Ubuntu Pro
  linux-image-fips                4.4.0.1126.128
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  linux-image-4.4.0-1156-aws      4.4.0-1156.162
                                  Available with Ubuntu Pro
  linux-image-4.4.0-283-generic   4.4.0-283.317~14.04.1
                                  Available with Ubuntu Pro
  linux-image-4.4.0-283-lowlatency  4.4.0-283.317~14.04.1
                                  Available with Ubuntu Pro
  linux-image-aws                 4.4.0.1156.153
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.283.317~14.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.283.317~14.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.283.317~14.04.1
                                  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-8548-1
  CVE-2021-47117, CVE-2021-47202, CVE-2023-52646, CVE-2024-56643,
  CVE-2026-23455, CVE-2026-31402, CVE-2026-31607, CVE-2026-31637,
  CVE-2026-31659, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
  CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,
  CVE-2026-43503, CVE-2026-45988, CVE-2026-46119, CVE-2026-46243

Package Information:
  https://launchpad.net/ubuntu/+source/linux-fips/4.4.0-112...



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