{"id":"CVE-2025-37984","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()\n\nHerbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa\nimplementation's ->key_size…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()\n\nHerbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa\nimplementation's ->key_size…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-190"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.6.70, < 6.6.99","linux_kernel >= 6.10, < 6.12.39","linux_kernel >= 6.13, < 6.14.5"],"patched":["linux_kernel 6.14.5"],"published":"2025-05-20","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:18:23.410","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-37984","references":[{"url":"https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00189,"epssPercentile":0.0845,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:46:35.354551Z"},"ingestedAt":"2026-10-15T22:48:25.487Z","slug":"CVE-2025-37984","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()\n\nHerbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa\nimplementation's ->key_size() callback returns an unusually large value.\nHerbert instead suggests (for a division by 8):\n\n  X / 8 + !!(X & 7)\n\nBased on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and\nuse it in lieu of DIV_ROUND_UP() for ->key_size() return values.\n\nAdditionally, use the macro in ecc_digits_from_bytes(), whose \"nbytes\"\nparameter is a ->key_size() return value in some instances, or a\nuser-specified ASN.1 length in the case of ecdsa_get_signature_rs().\n\n## Affected\n\n- `linux_kernel >= 6.6.70, < 6.6.99`\n- `linux_kernel >= 6.10, < 6.12.39`\n- `linux_kernel >= 6.13, < 6.14.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.14.5`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}