CVE-2026-64313
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
8.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-25 10:17:12.517000
Last modified
2026-10-24 13:10:00.147000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-25T10:17:12.517",
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{
"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 < 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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ecc - Corrección de desbordamiento de acarreo en la multiplicación vli\n\nEl cálculo del flag de acarreo falla cuando r01.m_high está saturado (0xFFFFFFFFFFFFFFFF) y la adición de bits inferiores se desborda.\n\nLa condición (r01.m_high < product.m_high) no maneja el caso donde r01.m_high == product.m_high y existe un acarreo adicional del desbordamiento de bits inferiores.\n\nCuando el commit 3c4b23901a0c (“crypto: ecdh - Add ECDH software support”) introdujo crypto/ecc.c, dividió la función muladd() en la biblioteca micro-ecc en helpers separados mul_64_64() y add_128_128(). Parece que la verificación se perdió en la traducción.\n\nAñadir manejo adecuado para este límite al tener en cuenta el acarreo de la adición inferior."
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