CVE-2021-47110
x86/kvm: Disable kvmclock on all CPUs on shutdown
Description
In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and this only happens for boot CPU. We need to disable it for all CPUs to guard against memory corruption e.g. on restore from hibernate. Note, writing '0' to kvmclock MSR doesn't clear memory location, it just prevents hypervisor from updating the location so for the short while after write and while CPU is still alive, the clock remains usable and correct so we don't need to switch to some other clocksource.
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 | HIGH | [email protected] |
Solution
- Update the Linux kernel packages.
- Reboot the system after updating.
Public PoC/Exploit Available at Github
CVE-2021-47110 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-2021-47110.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47110 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-2021-47110
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
allcve cve cvelist newcve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47110 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47110 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:H/I:N/A:H Added CWE CWE-459 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/1df2dc09926f61319116c80ee85701df33577d70 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046 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/1df2dc09926f61319116c80ee85701df33577d70 Added Reference https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 Added Reference https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a Added Reference https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046 -
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: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and this only happens for boot CPU. We need to disable it for all CPUs to guard against memory corruption e.g. on restore from hibernate. Note, writing '0' to kvmclock MSR doesn't clear memory location, it just prevents hypervisor from updating the location so for the short while after write and while CPU is still alive, the clock remains usable and correct so we don't need to switch to some other clocksource. Added Reference kernel.org https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046 [No types assigned]