vulnerability
Ubuntu: (CVE-2021-47386): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:L/Au:S/C:C/I:C/A:C) | May 21, 2024 | Nov 19, 2024 | Jun 12, 2025 |
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]
Solution(s)
References
- CVE-2021-47386
- https://attackerkb.com/topics/CVE-2021-47386
- URL-https://git.kernel.org/linus/943c15ac1b84d378da26bba41c83c67e16499ac4
- URL-https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
- URL-https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
- URL-https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
- URL-https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4
- URL-https://www.cve.org/CVERecord?id=CVE-2021-47386
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