Answer in brief
CVE-2021-47112 records a High severity (CVSS 7.8) vulnerability in x86/kvm: Teardown PV features on boot CPU as well. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 2.6.38 | Not reported |
| Linux/Linuxgeneric | >=fd10cde9294f73eeccbc16f3fec1ae6cde7b800c <7620a669111b52f224d006dea9e1e688e2d62c54 || >=fd10cde9294f73eeccbc16f3fec1ae6cde7b800c <38b858da1c58ad46519a257764e059e663b59ff2 || >=fd10cde9294f73eeccbc16f3fec1ae6cde7b800c <d1629b5b925de9b27979e929dae7fcb766daf6b6 || >=fd10cde9294f73eeccbc16f3fec1ae6cde7b800c <8b79feffeca28c5459458fe78676b081e87c93a4 | 7620a669111b52f224d006dea9e1e688e2d62c54, 38b858da1c58ad46519a257764e059e663b59ff2, d1629b5b925de9b27979e929dae7fcb766daf6b6, 8b79feffeca28c5459458fe78676b081e87c93a4 |
Published upstream
Mar 15, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.