FKIE_CVE-2026-74708

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-16 20:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: validate launch-time metadata size Launch-time metadata extends beyond the first 16 bytes of struct xsk_tx_metadata. Reject the request when the registered metadata area does not contain the complete field. Snapshot the validated flags for the generic transmit path and use that snapshot for request and completion processing, avoiding inconsistent decisions if user space changes the flags concurrently. Note that only xsk_skb_metadata is properly using the flags, __xsk_buff_get_metadata ignores them. Next commits address that.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/439ce2dddf3d22129b9113a7881637256a35e936
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/xdp_sock_drv.h",
            "net/xdp/xsk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "af511afa1d2977f384044df78d6fbf9fba653f7a",
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "versionType": "git"
            },
            {
              "lessThan": "bc63d47611c07b0d5d655fe1a590861931527920",
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "versionType": "git"
            },
            {
              "lessThan": "439ce2dddf3d22129b9113a7881637256a35e936",
              "status": "affected",
              "version": "ca4419f15abd19ba8be1e109661b60f9f5b6c9f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d9d736c416c9a85f84e15435ba82a177262e745b",
              "versionType": "git"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/xdp_sock_drv.h",
            "net/xdp/xsk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: validate launch-time metadata size\n\nLaunch-time metadata extends beyond the first 16 bytes of struct\nxsk_tx_metadata. Reject the request when the registered metadata area does\nnot contain the complete field.\n\nSnapshot the validated flags for the generic transmit path and use that\nsnapshot for request and completion processing, avoiding inconsistent\ndecisions if user space changes the flags concurrently.\n\nNote that only xsk_skb_metadata is properly using the flags,\n__xsk_buff_get_metadata ignores them. Next commits address that."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxsk: validar el tama\u00f1o de los metadatos en tiempo de lanzamiento\n\nLos metadatos en tiempo de lanzamiento se extienden m\u00e1s all\u00e1 de los primeros 16 bytes de struct xsk_tx_metadata. Rechazar la solicitud cuando el \u00e1rea de metadatos registrada no contiene el campo completo.\n\nTomar una instant\u00e1nea de los flags validados para la ruta de transmisi\u00f3n gen\u00e9rica y usar esa instant\u00e1nea para el procesamiento de solicitudes y finalizaciones, evitando decisiones inconsistentes si el espacio de usuario cambia los flags concurrentemente.\n\nTenga en cuenta que solo xsk_skb_metadata est\u00e1 utilizando correctamente los flags, __xsk_buff_get_metadata los ignora. Los pr\u00f3ximos commits abordan eso."
    }
  ],
  "id": "CVE-2026-74708",
  "lastModified": "2026-10-16T20:17:53.607",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-74708",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:15:12.386738Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-22T16:16:45.540",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/439ce2dddf3d22129b9113a7881637256a35e936"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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