Vulnerability in Linux
CVE-2021-47112
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.
EPSS: 0.002 (14.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions fd10cde9294f73eeccbc16f3fec1ae6cde7b800c, 2.6.38, 0
- Linux Linux_kernel — versions 5.13
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2021-47112?
- CVE-2021-47112 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2024-03-15.
- How severe is CVE-2021-47112?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-47112 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.