🛡️ CVE-2025-37984 — kernel

🟠 CVSS 7.0 — High ✅ No Known Exploit NVD
7.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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().

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2025-37984 is recorded against 2 packages.

  • kernel (from 6.10.0 up to 6.14.5)
  • linux-kernel (from 6.13 up to 6.14.5)

Timeline and source

Published on 20 May 2025 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-37984 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.0
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-05-20
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.10.0 6.14.5
linux-kernel 6.13 6.14.5

Similar Threats

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