Vulnerability Details : CVE-2021-47386
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]
Vulnerability category: Memory Corruption
Products affected by CVE-2021-47386
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-47386
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-47386
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2024-11-13 |
CWE ids for CVE-2021-47386
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
References for CVE-2021-47386
-
https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field - kernel/git/stable/linux.git - Linux kernel stable treePatch
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