CVE-2021-47112

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47112
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47112.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-47112
Downstream
Related
Published
2024-03-15T21:15:06Z
Modified
2025-08-09T20:01:26Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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 kvmcpudown_prepare(), register syscore ops to do the same for boot CPU.

References

Affected packages