{"id":"CVE-2026-64313","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 \u003c 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.","modified":"2026-07-28T04:03:03.977876785Z","published":"2026-07-25T08:49:44.546Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64313.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64313.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64313"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3c4b23901a0c766879dff680cd6bdab47bcdbbd2"},{"fixed":"d11b2bb99bec1f5557c01cac42231e23745f49b8"},{"fixed":"b709e0e768766abe29a49e1c1922a1604be602f4"},{"fixed":"24a54dfa06d09813b4802a374fad3d2c0e16a884"},{"fixed":"677450e5ef850c4d28b7956aa01104548c2a894e"},{"fixed":"5275e0fca256d081e2e7d4ba3dd8216c6e50d44e"},{"fixed":"774ddddf5eb26eeca177350413e3e2bc50930ee9"},{"fixed":"ebaae7c4251cc0cdb2602f334d4f08a3e82d271e"},{"fixed":"27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64313.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64313.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}