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CVE-2026-74707

Estado: RecibidaAlta (7.8)—

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

xsk: validate metadata when processing requests

The zero-copy path validates TX metadata while obtaining the descriptor context, then reads it again later when preparing the hardware request. User space can change the metadata between those operations and bypass the original validation.

Validate the metadata in xsk_tx_metadata_request() and use the resulting flags snapshot for every feature check. Read request fields once so all zero-copy drivers process only values observed after successful validation.

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 local en kernel (AV:L, PR:L) que permite a un proceso con privilegios de usuario modificar metadatos entre validaciones sucesivas, escalando a lectura/corrupción de datos del kernel o bypass de controles de seguridad.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageExecution PreventionEncrypt Sensitive InformationApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74707",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "lessThan": "5fd121971912dee2f5af1efec64462ac722deb17",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "lessThan": "0cc7aa6e0d19027fdd42e6fbd156267ac1e3bbba",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "lessThan": "849b1664dbda1cf6c63e0fd4f9dec23782b8c851",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d9d736c416c9a85f84e15435ba82a177262e745b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.14.2",
              "lessThan": "6.15",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_main.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
            "include/net/libeth/xsk.h",
            "include/net/xdp_sock_drv.h",
            "net/xdp/xsk_buff_pool.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_main.c",
            "drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
            "include/net/libeth/xsk.h",
            "include/net/xdp_sock_drv.h",
            "net/xdp/xsk_buff_pool.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-22T16:16:45.433",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0cc7aa6e0d19027fdd42e6fbd156267ac1e3bbba",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5fd121971912dee2f5af1efec64462ac722deb17",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/849b1664dbda1cf6c63e0fd4f9dec23782b8c851",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: validate metadata when processing requests\n\nThe zero-copy path validates TX metadata while obtaining the descriptor\ncontext, then reads it again later when preparing the hardware request.\nUser space can change the metadata between those operations and bypass the\noriginal validation.\n\nValidate the metadata in xsk_tx_metadata_request() and use the resulting\nflags snapshot for every feature check. Read request fields once so all\nzero-copy drivers process only values observed after successful\nvalidation."
    }
  ],
  "lastModified": "2026-08-25T06:18:55.180",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}