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CVE-2026-64313

8.8 · HIGH

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 (0xFFFFFFF…

Published Jul 25, 2026EPSS 0.35%

Overview

CVE-2026-64313 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884Refgit.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406Refgit.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44eRefgit.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894eRefgit.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9Refgit.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4Refgit.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8Refgit.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64313?

CVE-2026-64313 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-64313?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64313?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64313?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64313 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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