NULL pointer dereference in Linux kernel hwmon driver

1) NULL pointer dereference

EUVDB-ID: #VU90503

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47386

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the w83791d_detect_subclients() function in drivers/hwmon/w83791d.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
http://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
http://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
http://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.