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Review reviewHigh

CVE-2026-64313

Linux

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()...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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()...

Affected product and versions

Product
Linux
Affected versions
>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < d11b2bb99bec1f5557c01cac42231e23745f49b8, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < b709e0e768766abe29a49e1c1922a1604be602f4, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 24a54dfa06d09813b4802a374fad3d2c0e16a884, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 677450e5ef850c4d28b7956aa01104548c2a894e, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 774ddddf5eb26eeca177350413e3e2bc50930ee9, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < ebaae7c4251cc0cdb2602f334d4f08a3e82d271e, >= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 < 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406, >= 4.8
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available