CVE-2021-47062
KVM SVM Null Pointer Dereference Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting VMSAs for SEV, which effectively switches to use online_vcpus instead of created_vcpus. This fixes a possible null-pointer dereference as created_vcpus does not guarantee a vCPU exists, since it is updated at the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the bulk of vCPU creation to run in parallel, while still correctly restricting the max number of max vCPUs.
INFO
Published Date :
Feb. 29, 2024, 11:15 p.m.
Last Modified :
Dec. 10, 2024, 4:43 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
- There is no known solution at this time.
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-2021-47062.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47062 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-2021-47062
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47062 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47062 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]
Dec. 10, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4 Changed Reference Type https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 No Types Assigned https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 Patch Changed Reference Type https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 No Types Assigned https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 Patch Changed Reference Type https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 No Types Assigned https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 Patch Changed Reference Type https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 No Types Assigned https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 Patch Changed Reference Type https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 No Types Assigned https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 Patch Changed Reference Type https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 No Types Assigned https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 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/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 Added Reference https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 Added Reference https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 -
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
Feb. 29, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting VMSAs for SEV, which effectively switches to use online_vcpus instead of created_vcpus. This fixes a possible null-pointer dereference as created_vcpus does not guarantee a vCPU exists, since it is updated at the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the bulk of vCPU creation to run in parallel, while still correctly restricting the max number of max vCPUs. Added Reference Linux https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1 [No types assigned]