CVE-2021-47112

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

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.01%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54	patch
https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2	patch
https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6	patch
https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4	patch

Frequently Asked Questions

What is the severity of CVE-2021-47112?: CVE-2021-47112 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47112?: To fix CVE-2021-47112, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47112 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-47112 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47112?: CVE-2021-47112 affects Linux Linux, Linux Linux.

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