CVE-2021-46977
KVM Xen VMX Preemption Disablement Information Disclosure
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host's value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit.
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Jan. 8, 2025, 5:34 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 kernel package to resolve the vulnerability.
- Reboot the system after the update.
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-2021-46977.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-46977 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-2021-46977
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-2021-46977 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-46977 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]
Jan. 08, 2025
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 NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.38 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.22 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.5 *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089 No Types Assigned https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089 Patch Changed Reference Type https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089 No Types Assigned https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089 Patch Changed Reference Type https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 No Types Assigned https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 Patch Changed Reference Type https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 No Types Assigned https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 Patch Changed Reference Type https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 No Types Assigned https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 Patch Changed Reference Type https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 No Types Assigned https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 Patch Changed Reference Type https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed No Types Assigned https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed Patch Changed Reference Type https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed No Types Assigned https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed 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/31f29749ee970c251b3a7e5b914108425940d089 Added Reference https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 Added Reference https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 Added Reference https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed -
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. 28, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host's value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit. Added Reference Linux https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890 [No types assigned]