Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.4.125 |
References
- https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2Patch
- https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54Patch
- https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4Patch
- https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6Patch
- https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2Patch
- https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54Patch
- https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4Patch
- https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6Patch
FAQ
What is CVE-2021-47112?
CVE-2021-47112 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 wi...
How severe is CVE-2021-47112?
CVE-2021-47112 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47112?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.