Ubuntu alert USN-7861-3 (linux-nvidia-6.8, linux-oracle, linux-oracle-6.8)

From:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7861-3] Linux kernel vulnerabilities
Date:
             
 
Thu, 13 Nov 2025 11:52:17 -0300
Message-ID:
             
 
<c4a93925-6d2c-4290-b83f-9e8c05fc4c30@canonical.com>
==========================================================================
Ubuntu Security Notice USN-7861-3
November 13, 2025

linux-nvidia-6.8, linux-oracle, linux-oracle-6.8 vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-nvidia-6.8: Linux kernel for NVIDIA systems
- linux-oracle-6.8: Linux kernel for Oracle Cloud 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 24.04 LTS
   linux-image-6.8.0-1039-oracle   6.8.0-1039.40
   linux-image-6.8.0-1039-oracle-64k  6.8.0-1039.40
   linux-image-oracle-6.8          6.8.0-1039.40
   linux-image-oracle-64k-6.8      6.8.0-1039.40
   linux-image-oracle-64k-lts-24.04  6.8.0-1039.40
   linux-image-oracle-lts-24.04    6.8.0-1039.40

Ubuntu 22.04 LTS
   linux-image-6.8.0-1039-oracle   6.8.0-1039.40~22.04.1
   linux-image-6.8.0-1039-oracle-64k  6.8.0-1039.40~22.04.1
   linux-image-6.8.0-1042-nvidia   6.8.0-1042.45~22.04.1
   linux-image-6.8.0-1042-nvidia-64k  6.8.0-1042.45~22.04.1
   linux-image-nvidia-6.8          6.8.0-1042.45~22.04.1
   linux-image-nvidia-64k-6.8      6.8.0-1042.45~22.04.1
   linux-image-nvidia-64k-hwe-22.04  6.8.0-1042.45~22.04.1
   linux-image-nvidia-hwe-22.04    6.8.0-1042.45~22.04.1
   linux-image-oracle              6.8.0-1039.40~22.04.1
   linux-image-oracle-6.8          6.8.0-1039.40~22.04.1
   linux-image-oracle-64k          6.8.0-1039.40~22.04.1
   linux-image-oracle-64k-6.8      6.8.0-1039.40~22.04.1

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-7861-3
   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-oracle/6.8.0-1...
   https://launchpad.net/ubuntu/+source/linux-nvidia-6.8/6.8...
   https://launchpad.net/ubuntu/+source/linux-oracle-6.8/6.8...



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