{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64313",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64313"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "crypto: ecc - Fix carry overflow in vli multiplication",
  "details": "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 < product.m_high) doesn't 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The concrete unauthenticated external path is Bluetooth LE Secure Connections, where a nearby peer's 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's 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."
    }
  }
}