Ubuntu alert USN-7861-4 (linux-aws-6.8)

From:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7861-4] Linux kernel (AWS) vulnerabilities
Date:
             
 
Wed, 19 Nov 2025 18:40:46 -0300
Message-ID:
             
 
<3c4d922c-956d-4742-ae04-7902f5f97fe4@canonical.com>
==========================================================================
Ubuntu Security Notice USN-7861-4
November 19, 2025

linux-aws-6.8 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-aws-6.8: Linux kernel for Amazon Web Services (AWS) systems

Details:

Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)

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:
   - HSI subsystem;
   - Bluetooth subsystem;
   - Timer subsystem;
(CVE-2025-37838, CVE-2025-38118, CVE-2025-38352)

Update instructions:

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

Ubuntu 22.04 LTS
   linux-image-6.8.0-1042-aws      6.8.0-1042.44~22.04.1
   linux-image-6.8.0-1042-aws-64k  6.8.0-1042.44~22.04.1
   linux-image-aws                 6.8.0-1042.44~22.04.1
   linux-image-aws-6.8             6.8.0-1042.44~22.04.1
   linux-image-aws-64k             6.8.0-1042.44~22.04.1
   linux-image-aws-64k-6.8         6.8.0-1042.44~22.04.1

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-7861-4
   https://ubuntu.com/security/notices/USN-7861-3
   https://ubuntu.com/security/notices/USN-7861-2
   https://ubuntu.com/security/notices/USN-7861-1
   CVE-2025-37838, CVE-2025-38118, CVE-2025-38352, CVE-2025-40300

Package Information:
   https://launchpad.net/ubuntu/+source/linux-aws-6.8/6.8.0-...



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