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CVE-2023-54065

Estado: AplazadaAlta (7.8)—

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

net: dsa: realtek: fix out-of-bounds access

The probe function sets priv->chip_data to (void *)priv + sizeof(*priv) with the expectation that priv has enough trailing space.

However, only realtek-smi actually allocated this chip_data space. Do likewise in realtek-mdio to fix out-of-bounds accesses.

These accesses likely went unnoticed so far, because of an (unused) buf[4096] member in struct realtek_priv, which caused kmalloc to round up the allocated buffer to a big enough size, so nothing of value was overwritten. With a different allocator (like in the barebox bootloader port of the driver) or with KASAN, the memory corruption becomes quickly apparent.

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) sin interacción de usuario (PR:L) en kernel Linux permite corrupción de memoria por out-of-bounds access, escalando privilegios y potencialmente causando DoS o corrupción de datos.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

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-2023-54065",
  "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": "aac94001067da183455d6d37959892744fa01d9d",
              "lessThan": "cc0f9bb99735d2b68fac68f37b585d615728ce5b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aac94001067da183455d6d37959892744fa01d9d",
              "lessThan": "fe668aa499b4b95425044ba11af9609db6ecf466",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aac94001067da183455d6d37959892744fa01d9d",
              "lessThan": "b93eb564869321d0dffaf23fcc5c88112ed62466",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/dsa/realtek/realtek-mdio.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.23",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/dsa/realtek/realtek-mdio.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:16:08.337",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/b93eb564869321d0dffaf23fcc5c88112ed62466",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cc0f9bb99735d2b68fac68f37b585d615728ce5b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fe668aa499b4b95425044ba11af9609db6ecf466",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: realtek: fix out-of-bounds access\n\nThe probe function sets priv->chip_data to (void *)priv + sizeof(*priv)\nwith the expectation that priv has enough trailing space.\n\nHowever, only realtek-smi actually allocated this chip_data space.\nDo likewise in realtek-mdio to fix out-of-bounds accesses.\n\nThese accesses likely went unnoticed so far, because of an (unused)\nbuf[4096] member in struct realtek_priv, which caused kmalloc to\nround up the allocated buffer to a big enough size, so nothing of\nvalue was overwritten. With a different allocator (like in the barebox\nbootloader port of the driver) or with KASAN, the memory corruption\nbecomes quickly apparent."
    }
  ],
  "lastModified": "2026-08-04T10:19:27.090",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}