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CVE-2026-68479

Estado: RecibidaAlta (7.8)—

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

Bluetooth: btrtl: validate firmware patch bounds

rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the firmware version. A malformed firmware patch shorter than the version field can make this subtraction underflow and turn the copy into an oversized read and write during Bluetooth setup.

The existing patch_offset + patch_length check can also wrap on 32-bit architectures. Validate the patch length and range without arithmetic overflow before allocating or copying the patch.

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.

Acceso local (AV:L) con PR:L sin interacción: escalada de privilegios. Underflow en lectura/escritura de memoria en btrtl permite ejecución de código o DoS durante setup Bluetooth.

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

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

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-2026-68479",
  "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": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "39e01b4addfbbe177567d6ed1dfb81f9cccb19e6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "bda3c598ade6ea03884074b91e31608326684921",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "a4cb830e0b55ac76c849fd7840afb251f4c028fa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "68c5a2a19987c035eb129e627e579adafb04f637",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "83534891c058ed71e251135072640911670869aa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "6744ab60dfac55d1df5733960aad5be300984301",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "f1ca750c0510bdbb504bf084d2f196ef2af92ea6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db33c77dddc2ed2cff3061d0b096a9f5ab0c3647",
              "lessThan": "609c5b04a28dc1b0f3af6a7bc93055135b2d2059",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/bluetooth/btrtl.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/bluetooth/btrtl.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:20:51.380",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btrtl: validate firmware patch bounds\n\nrtlbt_parse_firmware() copies patch_length - 4 bytes before appending the\nfirmware version. A malformed firmware patch shorter than the version field\ncan make this subtraction underflow and turn the copy into an oversized\nread and write during Bluetooth setup.\n\nThe existing patch_offset + patch_length check can also wrap on 32-bit\narchitectures. Validate the patch length and range without arithmetic\noverflow before allocating or copying the patch."
    }
  ],
  "lastModified": "2026-08-17T06:17:57.447",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}