Tracker / CVE-2021-47112
CVE-2021-47112
High 7.8
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.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · … → 5.4.125 |
| linux | linux_kernel · 5.11 → 5.12.10 |
| linux | linux_kernel · 5.5 → 5.10.43 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.