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CVE-2026-64319

Estado: AnalizadaCrítica (9.1)—

In the Linux kernel, the following vulnerability has been resolved:

nvmet-auth: validate reply message payload bounds against transfer length

nvmet_auth_reply() accesses the variable-length rval[] array using attacker-controlled hl (hash length) and dhvlen (DH value length) fields without verifying they fit within the allocated buffer of tl bytes.

A malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a small transfer length but large hl/dhvlen values, causing out-of-bounds heap reads when the target processes the DH public key (rval + 2*hl) or performs the host response memcmp.

With DH authentication configured, the OOB pointer is passed directly to sg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching up to 526 bytes past the buffer. This is exploitable pre-authentication.

Leer descripción completaMostrar menos

Add bounds validation ensuring sizeof(*data) + 2*hl + dhvlen <= tl before any access to the variable-length fields.

Discovered by Atuin - Automated Vulnerability Discovery Engine.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad crítica (CVSS 9.8) en kernel NVMe-oF remota sin autenticación (AV:N/PR:N/UI:N). Buffer OOB (CWE-125) permite lectura no autorizada de memoria kernel y DoS por fallo de puntero en criptografía.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "value": "CWE-125"
        }
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: validate reply message payload bounds against transfer length\n\nnvmet_auth_reply() accesses the variable-length rval[] array using\nattacker-controlled hl (hash length) and dhvlen (DH value length) fields\nwithout verifying they fit within the allocated buffer of tl bytes.\n\nA malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a\nsmall transfer length but large hl/dhvlen values, causing out-of-bounds\nheap reads when the target processes the DH public key (rval + 2*hl) or\nperforms the host response memcmp.\n\nWith DH authentication configured, the OOB pointer is passed directly to\nsg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching\nup to 526 bytes past the buffer. This is exploitable pre-authentication.\n\nAdd bounds validation ensuring sizeof(*data) + 2*hl + dhvlen <= tl before\nany access to the variable-length fields.\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine."
    }
  ],
  "lastModified": "2026-09-03T15:49:13.867",
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