{"id":"CVE-2026-64313","title":"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 ov…","summary":"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 ov…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","published":"2026-07-25","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64313","references":[{"url":"https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00354,"epssPercentile":0.29206,"ingestedAt":"2026-07-27T06:16:50.372Z","slug":"CVE-2026-64313","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}