[USN-7862-1] Linux kernel vulnerability
Rodrigo Figueiredo Zaiden
rodrigo.zaiden at canonical.com
Thu Nov 6 10:23:18 UTC 2025
==========================================================================
Ubuntu Security Notice USN-7862-1
November 06, 2025
linux, linux-aws, linux-aws-5.15, linux-gcp, linux-gcp-5.15, linux-gke,
linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iotg,
linux-intel-iotg-5.15, linux-lowlatency, linux-lowlatency-hwe-5.15,
linux-nvidia, linux-oracle, linux-oracle-5.15 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
The system could be made to expose sensitive information.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-intel-iotg: Linux kernel for Intel IoT platforms
- linux-lowlatency: Linux low latency kernel
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-ibm-5.15: Linux kernel for IBM cloud systems
- linux-intel-iotg-5.15: Linux kernel for Intel IoT platforms
- linux-lowlatency-hwe-5.15: Linux low latency kernel
- linux-oracle-5.15: 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
linux-image-5.15.0-1079-gkeop 5.15.0-1079.87
linux-image-5.15.0-1090-ibm 5.15.0-1090.93
linux-image-5.15.0-1091-intel-iotg 5.15.0-1091.97
linux-image-5.15.0-1091-nvidia 5.15.0-1091.92
linux-image-5.15.0-1091-nvidia-lowlatency 5.15.0-1091.92
linux-image-5.15.0-1092-gke 5.15.0-1092.98
linux-image-5.15.0-1093-oracle 5.15.0-1093.99
linux-image-5.15.0-1096-aws 5.15.0-1096.103
linux-image-5.15.0-1096-aws-64k 5.15.0-1096.103
linux-image-5.15.0-1096-gcp 5.15.0-1096.105
linux-image-5.15.0-161-generic 5.15.0-161.171
linux-image-5.15.0-161-generic-64k 5.15.0-161.171
linux-image-5.15.0-161-generic-lpae 5.15.0-161.171
linux-image-5.15.0-161-lowlatency 5.15.0-161.171
linux-image-5.15.0-161-lowlatency-64k 5.15.0-161.171
linux-image-aws-5.15 5.15.0.1096.99
linux-image-aws-64k-5.15 5.15.0.1096.99
linux-image-aws-64k-lts-22.04 5.15.0.1096.99
linux-image-aws-lts-22.04 5.15.0.1096.99
linux-image-gcp-5.15 5.15.0.1096.92
linux-image-gcp-lts-22.04 5.15.0.1096.92
linux-image-generic 5.15.0.161.157
linux-image-generic-5.15 5.15.0.161.157
linux-image-generic-64k 5.15.0.161.157
linux-image-generic-64k-5.15 5.15.0.161.157
linux-image-generic-lpae 5.15.0.161.157
linux-image-generic-lpae-5.15 5.15.0.161.157
linux-image-gke 5.15.0.1092.91
linux-image-gke-5.15 5.15.0.1092.91
linux-image-gkeop 5.15.0.1079.78
linux-image-gkeop-5.15 5.15.0.1079.78
linux-image-ibm 5.15.0.1090.86
linux-image-ibm-5.15 5.15.0.1090.86
linux-image-intel-iotg 5.15.0.1091.91
linux-image-intel-iotg-5.15 5.15.0.1091.91
linux-image-lowlatency 5.15.0.161.139
linux-image-lowlatency-5.15 5.15.0.161.139
linux-image-lowlatency-64k 5.15.0.161.139
linux-image-lowlatency-64k-5.15 5.15.0.161.139
linux-image-nvidia 5.15.0.1091.91
linux-image-nvidia-5.15 5.15.0.1091.91
linux-image-nvidia-lowlatency 5.15.0.1091.91
linux-image-nvidia-lowlatency-5.15 5.15.0.1091.91
linux-image-oracle-5.15 5.15.0.1093.89
linux-image-oracle-lts-22.04 5.15.0.1093.89
linux-image-virtual 5.15.0.161.157
linux-image-virtual-5.15 5.15.0.161.157
Ubuntu 20.04 LTS
linux-image-5.15.0-1090-ibm 5.15.0-1090.93~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1091-intel-iotg 5.15.0-1091.97~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1093-oracle 5.15.0-1093.99~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1096-aws 5.15.0-1096.103~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1096-gcp 5.15.0-1096.105~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-161-generic 5.15.0-161.171~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-161-generic-64k 5.15.0-161.171~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-161-generic-lpae 5.15.0-161.171~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-161-lowlatency 5.15.0-161.171~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-161-lowlatency-64k 5.15.0-161.171~20.04.1
Available with Ubuntu Pro
linux-image-aws 5.15.0.1096.103~20.04.1
Available with Ubuntu Pro
linux-image-aws-5.15 5.15.0.1096.103~20.04.1
Available with Ubuntu Pro
linux-image-gcp 5.15.0.1096.105~20.04.1
Available with Ubuntu Pro
linux-image-gcp-5.15 5.15.0.1096.105~20.04.1
Available with Ubuntu Pro
linux-image-generic-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-hwe-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-hwe-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-ibm 5.15.0.1090.93~20.04.1
Available with Ubuntu Pro
linux-image-ibm-5.15 5.15.0.1090.93~20.04.1
Available with Ubuntu Pro
linux-image-intel 5.15.0.1091.97~20.04.1
Available with Ubuntu Pro
linux-image-intel-iotg 5.15.0.1091.97~20.04.1
Available with Ubuntu Pro
linux-image-intel-iotg-5.15 5.15.0.1091.97~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-hwe-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04b 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04c 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04d 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-oracle 5.15.0.1093.99~20.04.1
Available with Ubuntu Pro
linux-image-oracle-5.15 5.15.0.1093.99~20.04.1
Available with Ubuntu Pro
linux-image-virtual-5.15 5.15.0.161.171~20.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-20.04 5.15.0.161.171~20.04.1
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-7862-1
CVE-2025-40300
Package Information:
https://launchpad.net/ubuntu/+source/linux/5.15.0-161.171
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1096.103
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1096.105
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1092.98
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1079.87
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1090.93
https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1091.97
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-161.171
https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1091.92
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1093.99
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