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CVE-2025-39921

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback In commit 13529647743d9 ("spi: microc…

Published Oct 1, 2025EPSS 0.13%

Overview

CVE-2025-39921 is a medium-severity vulnerability. It was published on October 1, 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:

spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback

In commit 13529647743d9 ("spi: microchip-core-qspi: Support per spi-mem

operation frequency switches") the logic for checking the viability of

op->max_freq in mchp_coreqspi_setup_clock() was copied into

mchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid

when this function is called during probe but is instead zero.

Accordingly, baud_rate_val is calculated to be INT_MAX due to division

by zero, causing probe of the attached memory device to fail.

Seemingly spi-microchip-core-qspi was the only driver that had such a

modification made to its supports_op callback when the per_op_freq

capability was added, so just remove it to restore prior functionality.

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/89e7353f522f5cf70cb48c01ce2dcdcb275b8022Refgit.kernel.org/stable/c/ac8a13f35d5b8996582b3f97b924838a5c570c18

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39921?

CVE-2025-39921 is a medium-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39921?

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-2025-39921?

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-2025-39921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39921 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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