CVE-2021-47386
W83791d hwmon Null Pointer Dereference
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignment]
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 2, 2025, 2:52 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
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-2021-47386.
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-2021-47386 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47386 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]
Apr. 02, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.14.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.71 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.151 Added Reference Type CVE: https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 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/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c Added Reference https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80 Added Reference https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 Added Reference https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 13, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-476 Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignment] Added Reference kernel.org https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47386 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-2021-47386
weaknesses.