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CVE-2025-21656

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur scsi_execute_cmd() function can return both negativ…

Published Jan 21, 2025EPSS 0.20%

Overview

CVE-2025-21656 is a medium-severity vulnerability. It was published on January 21, 2025 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: (drivetemp) Fix driver producing garbage data when SCSI errors occur

scsi_execute_cmd() function can return both negative (linux codes) and

positive (scsi_cmnd result field) error codes.

Currently the driver just passes error codes of scsi_execute_cmd() to

hwmon core, which is incorrect because hwmon only checks for negative

error codes. This leads to hwmon reporting uninitialized data to

userspace in case of SCSI errors (for example if the disk drive was

disconnected).

This patch checks scsi_execute_cmd() output and returns -EIO if it's

error code is positive.

[groeck: Avoid inline variable declaration for portability]

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/42268d885e44af875a6474f7bba519cc6cea6a9dRefgit.kernel.org/stable/c/53e25b10a28edaf8c2a1d3916fd8929501a50dfcRefgit.kernel.org/stable/c/82163d63ae7a4c36142cd252388737205bb7e4b9

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21656?

CVE-2025-21656 is a medium-severity vulnerability. It was published on January 21, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21656?

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-2025-21656?

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-2025-21656?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21656 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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