CVE-2026-64313

HIGH

MEDIUM Priority: 0.03 BB Relevance: 63/100

Published: 2026-07-25 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Adjacent Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Adjacent

AC: Low

PR: None

UI: None

S: Unchanged

C: High

I: High

A: High

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: ecc - Fix carry overflow in vli multiplication The carry flag calculation fails when r01.m_high is saturated (0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows. The condition (r01.m_high < product.m_high) doesn't handle the case where r01.m_high == product.m_high and an additional carry exists from lower-bit overflow. When commit 3c4b23901a0c ("crypto: ecdh - Add ECDH software support") introduced crypto/ecc.c, it split the muladd() function in the micro-ecc library into separate mul_64_64() and add_128_128() helpers. It seems the check got lost in translation. Add proper handling for this boundary by accounting for the carry from the lower addition.

Weakness Classification (1)

CWE-190

Affected Software (7)

Vendor	Product	Version
linux	linux_kernel	4.8 – 5.10.261
linux	linux_kernel	5.11 – 5.15.212
linux	linux_kernel	5.16 – 6.1.178
linux	linux_kernel	6.2 – 6.6.145
linux	linux_kernel	6.7 – 6.12.96
linux	linux_kernel	6.13 – 6.18.39
linux	linux_kernel	6.19 – 7.1.4