CVE-2021-47384
Apache Linux Kernel hwmon Null Pointer Dereference Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 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 alignments]
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 :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
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-2021-47384.
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-2021-47384 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47384 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.
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Initial Analysis by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Added CWE CWE-476 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/6cb01fe630eaffc5a2c3f7364436caddba286623 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 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/6cb01fe630eaffc5a2c3f7364436caddba286623 Added Reference https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc Added Reference https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 Added Reference https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 06, 2024
Action Type Old Value New Value Added CVSS V3.1 CISA-ADP AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L -
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: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 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 alignments] Added Reference kernel.org https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 [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-2021-47384 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-2021-47384
weaknesses.