CVE-2026-64313 (GCVE-0-2026-64313)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59
VLAI
EPSS
VEX
Title
crypto: ecc - Fix carry overflow in vli multiplication
Summary
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.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < d11b2bb99bec1f5557c01cac42231e23745f49b8
(git)
Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < b709e0e768766abe29a49e1c1922a1604be602f4 (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < 24a54dfa06d09813b4802a374fad3d2c0e16a884 (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < 677450e5ef850c4d28b7956aa01104548c2a894e (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < 774ddddf5eb26eeca177350413e3e2bc50930ee9 (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < ebaae7c4251cc0cdb2602f334d4f08a3e82d271e (git) Affected: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 , < 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406 (git) |
|
| Linux | Linux |
Affected:
4.8
Unaffected: 0 , < 4.8 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecc - Fix carry overflow in vli multiplication\n\nThe carry flag calculation fails when r01.m_high is saturated\n(0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows.\n\nThe condition (r01.m_high \u003c product.m_high) doesn\u0027t handle the case\nwhere r01.m_high == product.m_high and an additional carry exists\nfrom lower-bit overflow.\n\nWhen commit 3c4b23901a0c (\"crypto: ecdh - Add ECDH software support\")\nintroduced crypto/ecc.c, it split the muladd() function in the\nmicro-ecc library into separate mul_64_64() and add_128_128() helpers.\nIt seems the check got lost in translation.\n\nAdd proper handling for this boundary by accounting for the carry\nfrom the lower addition."
}
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"dateReserved": "2026-07-19T15:36:31.779Z",
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"date": "2026-07-26",
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"initial_release_date": "2026-07-26T01:02:05.000Z",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "crypto: ecc - Fix carry overflow in vli multiplication",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64313.json",
"version": "1"
},
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"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T16:45:57Z",
"cve": "CVE-2026-64313",
"id": "CVE-2026-64313",
"initial_release_date": "2026-07-25T16:45:57Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64313",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64313.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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