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CVE-2026-68253

Estado: RecibidaAlta (7.8)—

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

drm/i915/hdcp: check streams[] bounds before overflow

The data->streams[] overflow check is done after the buffer overflow has already happened. Move the overflow check before the write.

Side note, emitting a warning splat with a backtrace might be overkill here, but prefer not changing the behaviour other than not doing the overrun.

Discovered using AI-assisted static analysis confirmed by Intel Product Security.

(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)

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.

Buffer overflow en kernel Linux (AV:L, PR:L, UI:N) permite escalada local. Acceso local con privilegios de usuario escalando sin interacción del usuario encaja en T1068. Ejecución de código y potencial DoS del kernel como impactos.

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-2026-68253",
  "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": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "336cf6d80d41457442b659e7ba7a7badc0ffe79d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "389079bf04e6f0c6f10f5b879f6d7a9cf80f0567",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "84351f12390349ba010920fc247e1a0b12e41eb3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "2106fb490b2c6003e23ad6ff36ce823a2170e138",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "3d2ef8d389495e7889c6062d8bddc46d2a5fbdef",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "984085c5b53572e2e03fd5fc4817e86ef1effc6e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "lessThan": "bbb15a6b042d02e5508a02b4847e02d2579ee7bc",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/i915/display/intel_hdcp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "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/gpu/drm/i915/display/intel_hdcp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:13.860",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hdcp: check streams[] bounds before overflow\n\nThe data->streams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)"
    }
  ],
  "lastModified": "2026-08-23T13:16:35.467",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}