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CVE-2023-53516

Estado: AnalizadaAlta (7.8)—

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

macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF

The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff") added one additional attribute named IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.

However, it forgot to describe the nla_policy at macvlan_policy (drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer can be faked as empty (0 bytes) by a malicious user, which could leads to OOB in heap just like CVE-2023-3773.

To fix it, this commit just completes the nla_policy description for IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the potential OOB read.

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 de out-of-bounds heap en kernel Linux (CWE-787) accesible por usuario local sin interacción (AV:L/PR:L/UI:N), permitiendo ejecución de código. Vector CVSS dicta T1068 como escalada local.

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 InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-53516",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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": "954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348",
              "lessThan": "79f44709aa7a744fbfbadd4aef678443290c6991",
              "versionType": "git"
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            {
              "status": "affected",
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              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/macvlan.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": "6.4.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/macvlan.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-01T12:15:55.723",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF\n\nThe previous commit 954d1fa1ac93 (\"macvlan: Add netlink attribute for\nbroadcast cutoff\") added one additional attribute named\nIFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.\n\nHowever, it forgot to describe the nla_policy at macvlan_policy\n(drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer\ncan be faked as empty (0 bytes) by a malicious user, which could leads\nto OOB in heap just like CVE-2023-3773.\n\nTo fix it, this commit just completes the nla_policy description for\nIFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the\npotential OOB read."
    }
  ],
  "lastModified": "2026-06-17T06:45:30.793",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "645579C2-235B-4FCC-A399-CECF5423170F",
              "versionEndExcluding": "6.4.8",
              "versionStartIncluding": "6.4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0B3E6E4D-E24E-4630-B00C-8C9901C597B0"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E4A01A71-0F09-4DB2-A02F-7EFFBE27C98D"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F5608371-157A-4318-8A2E-4104C3467EA1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}