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CVE-2025-37984

7.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() Herbert notes that DIV_ROUND_UP() may overflow unnecessarily…

Published May 20, 2025CWE-190EPSS 0.19%

Overview

CVE-2025-37984 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. 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:

crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()

Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa

implementation's ->key_size() callback returns an unusually large value.

Herbert instead suggests (for a division by 8):

X / 8 + !!(X & 7)

Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and

use it in lieu of DIV_ROUND_UP() for ->key_size() return values.

Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes"

parameter is a ->key_size() return value in some instances, or a

user-specified ASN.1 length in the case of ecdsa_get_signature_rs().

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/921b8167f10708e38080f84e195cdc68a7a561f1Refgit.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275Refgit.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298bRefgit.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37984?

CVE-2025-37984 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2025-37984?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-37984?

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-2025-37984?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37984 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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