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CVE-2021-47385

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (…

Published May 21, 2024CWE-476EPSS 0.24%

Overview

CVE-2021-47385 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (w83792d) 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 multipline alignment]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278Refgit.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3Refgit.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1Refgit.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3Refgit.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278Refgit.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3Refgit.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1Refgit.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47385?

CVE-2021-47385 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47385?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47385?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47385?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47385 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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