Ubuntu alert USN-8361-3 (linux, linux-aws, linux-kvm)

From:
             
 
Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8361-3] Linux kernel vulnerability
Date:
             
 
Wed, 17 Jun 2026 07:36:24 -0300
Message-ID:
             
 
<04180785-2da7-45a1-9325-22088aa5d173@canonical.com>
Cc:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8361-3
June 17, 2026

linux, linux-aws, linux-kvm vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

The system could be compromised under certain conditions.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments

Details:

A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystem:
   - Packet sockets;
(CVE-2026-31504)

Update instructions:

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

Ubuntu 16.04 LTS
   linux-image-4.4.0-1156-kvm      4.4.0-1156.167
                                   Available with Ubuntu Pro
   linux-image-4.4.0-1193-aws      4.4.0-1193.208
                                   Available with Ubuntu Pro
   linux-image-4.4.0-281-generic   4.4.0-281.315
                                   Available with Ubuntu Pro
   linux-image-4.4.0-281-lowlatency  4.4.0-281.315
                                   Available with Ubuntu Pro
   linux-image-aws                 4.4.0.1193.197
                                   Available with Ubuntu Pro
   linux-image-generic             4.4.0.281.287
                                   Available with Ubuntu Pro
   linux-image-generic-lts-xenial  4.4.0.281.287
                                   Available with Ubuntu Pro
   linux-image-kvm                 4.4.0.1156.153
                                   Available with Ubuntu Pro
   linux-image-lowlatency          4.4.0.281.287
                                   Available with Ubuntu Pro
   linux-image-lowlatency-lts-xenial  4.4.0.281.287
                                   Available with Ubuntu Pro
   linux-image-virtual             4.4.0.281.287
                                   Available with Ubuntu Pro
   linux-image-virtual-lts-xenial  4.4.0.281.287
                                   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-8361-3
   https://ubuntu.com/security/notices/USN-8361-2
   https://ubuntu.com/security/notices/USN-8361-1
   CVE-2026-31504



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