CVE-2021-47112

MediumCVSS 5.5/10Last modified Aug 4, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

x86/kvm: Teardown PV features on boot CPU as well

Various PV features (Async PF, PV EOI, steal time) work through memory shared with hypervisor and when we restore from hibernation we must properly teardown all these features to make sure hypervisor doesn't write to stale locations after we jump to the previously hibernated kernel (which can try to place anything there). For secondary CPUs the job is already done by kvm_cpu_down_prepare(), register syscore ops to do the same for boot CPU.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= fd10cde9294f73eeccbc16f3fec1ae6cde7b800c, < 7620a669111b52f224d006dea9e1e688e2d62c54; >= fd10cde9294f73eeccbc16f3fec1ae6cde7b800c, < 38b858da1c58ad46519a257764e059e663b59ff2; >= fd10cde9294f73eeccbc16f3fec1ae6cde7b800c, < d1629b5b925de9b27979e929dae7fcb766daf6b6; >= fd10cde9294f73eeccbc16f3fec1ae6cde7b800c, < 8b79feffeca28c5459458fe78676b081e87c93a4
LinuxLinux2.6.38

References

Timeline

Published
Mar 15, 2024
Last modified
Aug 4, 2026
NVD status
Modified

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CVE-2021-47112: Medium severity, CVSS 5.5 | Vulnix