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Unscored USN-7860-4 1 CVE

linux-intel-iot-realtime, linux-realtime vulnerability

Published Nov 7, 2025 · Updated Jun 3, 2026

Ecosystem: Ubuntu

Summary

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.

Fixed packages 2

ReleasePackageFixed in
Ubuntu · Pro Realtime 22.04 LTS Pro:Realtime:22.04:LTS linux-intel-iot-realtime 5.15.0-1088.90
Ubuntu · Pro Realtime 22.04 LTS Pro:Realtime:22.04:LTS linux-realtime 5.15.0-1095.104

Vulnerabilities 1

  • Unscored —
    CVE-2025-40300

    x86/vmscape: Add conditional IBPB mitigation

    In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • report
    https://ubuntu.com/security/CVE-2025-40300