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Ubuntu Security Notice USN-7797-3
October 21, 2025

linux-aws vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) 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:
   - Virtio block driver;
   - Media drivers;
   - Network drivers;
   - Framebuffer layer;
   - BTRFS file system;
   - Ext4 file system;
   - Network file system (NFS) server daemon;
   - Packet sockets;
   - VMware vSockets driver;
(CVE-2025-38618, CVE-2024-35849, CVE-2025-37785, CVE-2024-49924,
CVE-2025-38617, CVE-2024-27078, CVE-2021-47149, CVE-2021-47319,
CVE-2025-21796, CVE-2021-47589)

Update instructions:

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

Ubuntu 16.04 LTS
   linux-image-4.4.0-1186-aws      4.4.0-1186.201
                                   Available with Ubuntu Pro
   linux-image-aws                 4.4.0.1186.190
                                   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-7797-3
   https://ubuntu.com/security/notices/USN-7797-2
   https://ubuntu.com/security/notices/USN-7797-1
   CVE-2021-47149, CVE-2021-47319, CVE-2021-47589, CVE-2024-27078,
   CVE-2024-35849, CVE-2024-49924, CVE-2025-21796, CVE-2025-37785,
   CVE-2025-38617, CVE-2025-38618