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Vulnerability record · CVE-2026-64313 · published 25 July 2026

CVE-2026-64313: Linux kernel integer overflow vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.35% · top 73.4% CWE-190 · Integer overflow
8.8CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
3 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884 Patch
https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 Patch
https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e Patch
https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e Patch
https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9 Patch
https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4 Patch
https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8 Patch
https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64313), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.