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CVE-2022-50861

Estado: AplazadaAlta (7.5)—

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

NFSD: Finish converting the NFSv2 GETACL result encoder

The xdr_stream conversion inadvertently left some code that set the page_len of the send buffer. The XDR stream encoders should handle this automatically now.

This oversight adds garbage past the end of the Reply message. Clients typically ignore the garbage, but NFSD does not need to send it, as it leaks stale memory contents onto the wire.

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.

Red accesible sin autenticación (AV:N/PR:N) en servicio NFSD que expone contenidos de memoria. Fuga de datos confidenciales (C:H) vía NFSv2 GETACL.

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

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-2022-50861",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "6677b0d16abe77702040768c96e2ea17cd5b3f6e",
              "lessThan": "a20b0abab966a189a79aba6ebf41f59024a3224d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f8cba47344f794b54373189bec23195b51020faf",
              "lessThan": "5030d4d2bf8b6f6f3d16401ab92a88bc5aa2377a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f8cba47344f794b54373189bec23195b51020faf",
              "lessThan": "d5b867fd2d7f79630b1a2906a7bb4f4b75bf297a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f8cba47344f794b54373189bec23195b51020faf",
              "lessThan": "2b825efb0577a32a872e872a869e0947cf9dd6d3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f8cba47344f794b54373189bec23195b51020faf",
              "lessThan": "ea5021e911d3479346a75ac9b7d9dcd751b0fb99",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/nfsd/nfs2acl.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/nfsd/nfs2acl.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:00.893",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2b825efb0577a32a872e872a869e0947cf9dd6d3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5030d4d2bf8b6f6f3d16401ab92a88bc5aa2377a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a20b0abab966a189a79aba6ebf41f59024a3224d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d5b867fd2d7f79630b1a2906a7bb4f4b75bf297a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ea5021e911d3479346a75ac9b7d9dcd751b0fb99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Finish converting the NFSv2 GETACL result encoder\n\nThe xdr_stream conversion inadvertently left some code that set the\npage_len of the send buffer. The XDR stream encoders should handle\nthis automatically now.\n\nThis oversight adds garbage past the end of the Reply message.\nClients typically ignore the garbage, but NFSD does not need to send\nit, as it leaks stale memory contents onto the wire."
    }
  ],
  "lastModified": "2026-08-04T10:18:24.693",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}