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().
INFO
Published Date :
May 20, 2025, 6:15 p.m.
Last Modified :
Nov. 14, 2025, 5 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply the provided kernel patch.
- Update to a patched kernel version.
- Review and apply the suggested formula for divisions.
- Use DIV_ROUND_UP_POW2 macro in relevant functions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-37984.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-37984 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-37984
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-37984 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-37984 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Nov. 14, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-190 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.14.5 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.10 up to (excluding) 6.12.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.70 up to (excluding) 6.6.99 Added Reference Type kernel.org: https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 17, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 20, 2025
Action Type Old Value New Value Added 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(). Added Reference https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1 Added Reference https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275