CVE-2021-47112
x86/kvm: Teardown PV features on boot CPU as well
Description
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.
INFO
Published Date :
March 15, 2024, 9:15 p.m.
Last Modified :
March 13, 2025, 7:36 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the affected Linux kernel packages.
- Reboot the system to apply the updates.
Public PoC/Exploit Available at Github
CVE-2021-47112 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47112.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47112 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47112
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Ini adalah repository kumpulan CVE v.5
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47112 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47112 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 13, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.12.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.43 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (excluding) 5.4.125 Added Reference Type CVE: https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6 Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2 Added Reference https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54 Added Reference https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4 Added Reference https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 15, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4 [No types assigned]