CVE-2026-64313 (GCVE-0-2026-64313)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 Version: 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 |
||
{
"containers": {
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"programFiles": [
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"vendor": "Linux",
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"version": "4.8"
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "5.10.261",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
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},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"vulnerable": true
},
{
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}
],
"negate": false,
"operator": "OR"
}
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],
"descriptions": [
{
"lang": "en",
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The concrete unauthenticated external path is Bluetooth LE Secure Connections, where a nearby peer\u0027s SMP Public Key message reaches the flawed ECC multiplication. Bluetooth requires proximity rather than routable network access.\nAC:L - The attacker controls the ECC operands and can repeatedly submit deliberately constructed values that trigger the carry error. No race, unpredictable memory layout, or victim-controlled state is required.\nPR:N - SMP permits a peer to negotiate Secure Connections and submit its public key before credential validation, DHKey confirmation, or bonding completes. No local account or capability is required.\nUI:N - The peer\u0027s public key is validated and the ECDH secret is computed before authentication-method completion. Headless and Just Works deployments require no human action.\nS:U - The vulnerable arithmetic and affected cryptographic consumers operate within the same kernel security authority. The vulnerability does not inherently cross a VM, IOMMU, or comparable security boundary.\nC:H - Incorrect field multiplication can undermine public-key validation and ECDH shared-secret computation. Faulty-curve or key-agreement attacks could expose secrets and all data protected by derived session keys.\nI:H - The same faulty multiplication supports ECDSA and ECRDSA verification, making false cryptographic results and signature or peer-authentication bypass defensible. This can authorize attacker-controlled content, code, or commands.\nA:H - Authentication bypass can authorize attacker-controlled code or commands capable of halting the system, while repeated crafted exchanges can prevent secure pairing. Safety-critical or headless devices dependent on the affected trust path can lose their protected function completely."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:53:13.285Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8"
},
{
"url": "https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4"
},
{
"url": "https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884"
},
{
"url": "https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e"
},
{
"url": "https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e"
},
{
"url": "https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9"
},
{
"url": "https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e"
},
{
"url": "https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406"
}
],
"title": "crypto: ecc - Fix carry overflow in vli multiplication",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64313",
"datePublished": "2026-07-25T08:49:44.546Z",
"dateReserved": "2026-07-19T15:36:31.779Z",
"dateUpdated": "2026-08-17T04:53:13.285Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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