1. Ubuntu Security Notices
  2. USN-7862-2

USN-7862-2: Linux kernel vulnerability

Publication date

10 November 2025

Overview

The system could be made to expose sensitive information.

Releases

Packages

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.

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
22.04 LTS jammy 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
20.04 LTS focal linux-image-5.15.0-1048-nvidia-tegra –  5.15.0-1048.48~20.04.1  
linux-image-5.15.0-1048-nvidia-tegra-rt –  5.15.0-1048.48~20.04.1  
linux-image-nvidia-tegra –  5.15.0.1048.48~20.04.1  
linux-image-nvidia-tegra-5.15 –  5.15.0.1048.48~20.04.1  
linux-image-nvidia-tegra-rt –  5.15.0.1048.48~20.04.1  
linux-image-nvidia-tegra-rt-5.15 –  5.15.0.1048.48~20.04.1  

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References

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