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CVE-2026-64313

HIGHCVSS 8.8/10EPSS 0.34%

Last modified

CVE-2026-64313 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
0.34%

27.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < d11b2bb99bec1f5557c01cac42231e23745f49b8; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < b709e0e768766abe29a49e1c1922a1604be602f4; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < 24a54dfa06d09813b4802a374fad3d2c0e16a884; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < 677450e5ef850c4d28b7956aa01104548c2a894e; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < 774ddddf5eb26eeca177350413e3e2bc50930ee9; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < ebaae7c4251cc0cdb2602f334d4f08a3e82d271e; >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2, < 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64313?
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.
How severe is CVE-2026-64313?
CVE-2026-64313 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64313?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST