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En ese escenario, parte del material clave de la clave anterior no se sobrescribir\u00eda. La soluci\u00f3n m\u00e1s sencilla es poner primero a cero expl\u00edcitamente toda la matriz de claves privadas. Tenga en cuenta que este parche cambia ligeramente el comportamiento de esta funci\u00f3n: anteriormente, si ecc_gen_privkey fallaba, la antigua clave privada permanecer\u00eda. Ahora, la private_key siempre se pone a cero. 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{"bugzilla": {"description": "kernel: crypto: ecdh - explicitly zeroize private_key", "id": "2300717", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300717"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncrypto: ecdh - explicitly zeroize private_key\nprivate_key is overwritten with the key parameter passed in by the\ncaller (if present), or alternatively a newly generated private key.\nHowever, it is possible that the caller provides a key (or the newly\ngenerated key) which is shorter than the previous key. In that\nscenario, some key material from the previous key would not be\noverwritten. The easiest solution is to explicitly zeroize the entire\nprivate_key array first.\nNote that this patch slightly changes the behavior of this function:\npreviously, if the ecc_gen_privkey failed, the old private_key would\nremain. Now, the private_key is always zeroized. This behavior is\nconsistent with the case where params.key is set and ecc_is_key_valid\nfails.", "A flaw was found in the Linux Kernel's Elliptic Curve Diffie-Hellman functionality, where the private_key is overwritten. In some special cases and when error path happens, this issue could allow leakage of this private key."], "name": "CVE-2024-42098", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42098\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42098\nhttps://lore.kernel.org/linux-cve-announce/2024072912-CVE-2024-42098-fe86@gregkh/T/#u"], "threat_severity": "Low"}