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CVE-2026-68401

Estado: RecibidaAlta (7.8)—

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

firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit()

2) Make sure there is enough size to write constituents.

While at it, convert the only sizeof() in the driver that uses a type instead of variable.

Detalles técnicos trazas, registros y código del informe original
Sashiko (locally) reports multiple out-of-bound issues in
ffa_setup_and_transmit:
1) Writing ep_mem_access->reserved can write out of bounds for FFA
   versions < 1.2 as ffa_emad_size_get() returns 16 bytes in that case
   while reserved has an offset of 24.
   Instead of zeroing fields, memset the struct to zero first based on
   the FFA version.

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 Linux (AV:L, PR:L) que permite escritura fuera de límites; escalada de privilegios mediante corrupción de memoria. El atacante puede ejecutar código arbitrario o manipular datos del sistema.

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 ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

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-2026-68401",
  "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": "111a833dc5cbef3d05b2a796a7e23cb7f6ff2192",
              "lessThan": "cf5708c9d78c98214c62b1e5d049cd527a543b8e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "111a833dc5cbef3d05b2a796a7e23cb7f6ff2192",
              "lessThan": "27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "111a833dc5cbef3d05b2a796a7e23cb7f6ff2192",
              "lessThan": "3383ffb7ef937317361713ffcc21921a7848511a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "28ebfb74fbf513e0c7cd2674d8c2400ee0220d18",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "22157f74458106c5900dbd938eb44623c22d97a0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b77ec23b6df41c48e88735230e11caec56163630",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.15.114",
              "lessThan": "5.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.1.31",
              "lessThan": "6.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.3.5",
              "lessThan": "6.4",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/firmware/arm_ffa/driver.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/firmware/arm_ffa/driver.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:33.600",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/27abdaf0c5c89b06694e4c3d8318e8d6a60c1d1b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3383ffb7ef937317361713ffcc21921a7848511a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cf5708c9d78c98214c62b1e5d049cd527a543b8e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit()\n\nSashiko (locally) reports multiple out-of-bound issues in\nffa_setup_and_transmit:\n1) Writing ep_mem_access->reserved can write out of bounds for FFA\n   versions < 1.2 as ffa_emad_size_get() returns 16 bytes in that case\n   while reserved has an offset of 24.\n   Instead of zeroing fields, memset the struct to zero first based on\n   the FFA version.\n\n2) Make sure there is enough size to write constituents.\n\nWhile at it, convert the only sizeof() in the driver that uses a\ntype instead of variable."
    }
  ],
  "lastModified": "2026-08-17T06:17:48.880",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}