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().
CVSS
No CVSS.
References
Configurations
No configuration.
History
25 Jul 2025, 14:15
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17 Jul 2025, 17:15
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20 May 2025, 18:15
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Information
Published : 2025-05-20 18:15
Updated : 2025-07-25 14:15
NVD link : CVE-2025-37984
Mitre link : CVE-2025-37984
JSON object : View
Products Affected
No product.
CWE
No CWE.