[USN-7862-2] Linux kernel vulnerability

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==========================================================================
Ubuntu Security Notice USN-7862-2
November 10, 2025

linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx,
linux-raspi 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-nvidia-tegra: Linux kernel for NVIDIA Tegra systems
- linux-nvidia-tegra-igx: Linux kernel for NVIDIA Tegra IGX systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-nvidia-tegra-5.15: Linux kernel for NVIDIA Tegra 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-5.15.0-1037-nvidia-tegra-igx 5.15.0-1037.37
linux-image-5.15.0-1037-nvidia-tegra-igx-rt 5.15.0-1037.37
linux-image-5.15.0-1048-nvidia-tegra 5.15.0-1048.48
linux-image-5.15.0-1048-nvidia-tegra-rt 5.15.0-1048.48
linux-image-5.15.0-1090-raspi 5.15.0-1090.93
linux-image-nvidia-tegra 5.15.0.1048.48
linux-image-nvidia-tegra-5.15 5.15.0.1048.48
linux-image-nvidia-tegra-igx 5.15.0.1037.39
linux-image-nvidia-tegra-igx-5.15 5.15.0.1037.39
linux-image-nvidia-tegra-igx-rt 5.15.0.1037.39
linux-image-nvidia-tegra-igx-rt-5.15 5.15.0.1037.39
linux-image-nvidia-tegra-rt 5.15.0.1048.48
linux-image-nvidia-tegra-rt-5.15 5.15.0.1048.48
linux-image-raspi 5.15.0.1090.88
linux-image-raspi-5.15 5.15.0.1090.88
linux-image-raspi-nolpae 5.15.0.1090.88

Ubuntu 20.04 LTS
linux-image-5.15.0-1048-nvidia-tegra 5.15.0-1048.48~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1048-nvidia-tegra-rt 5.15.0-1048.48~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra 5.15.0.1048.48~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-5.15 5.15.0.1048.48~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-rt 5.15.0.1048.48~20.04.1
Available with Ubuntu Pro
linux-image-nvidia-tegra-rt-5.15 5.15.0.1048.48~20.04.1
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-7862-2
https://ubuntu.com/security/notices/USN-7862-1
CVE-2025-40300

Package Information:
https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/5.15.0-1048.48
https://launchpad.net/ubuntu/+source/linux-nvidia-tegra-igx/5.15.0-1037.37
https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1090.93