CVE-2025-37984

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

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().

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1
https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275

Frequently Asked Questions

What is the severity of CVE-2025-37984?: CVE-2025-37984 has not yet been assigned a CVSS score.
How to fix CVE-2025-37984?: To fix CVE-2025-37984, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-37984 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-37984 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-37984?: CVE-2025-37984 affects Linux Linux, Linux Linux.

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