CVE-2021-47112: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.4.125
linux	linux_kernel	5.5 — 5.10.43
linux	linux_kernel	5.11 — 5.12.10
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2021-47112? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47112? +

CVE-2021-47112 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2021-47112? +

CVE-2021-47112 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-47112? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2021-47112