CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2021-47112
Medium (5.5) in linux linux kernel. EPSS 0.2% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- linux:linux_kernel
References
- 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