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CVE-2021-4148

Estado: ModificadaMedia (5.5)—

Se encontró una vulnerabilidad en la función block_invalidatepage del kernel de Linux en el archivo fs/buffer.c en el sistema de archivos. Una falta de comprobación de saneo puede permitir a un atacante local con privilegios de usuario causar un problema de denegación de servicio (DOS)

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).

Tecnologías afectadas (2)

Fedoraproject — FedoraLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-4148",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.9,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "kernel",
          "versions": [
            {
              "status": "affected",
              "version": "kernel 5.14.16"
            }
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  "published": "2022-03-23T20:15:09.947",
  "references": [
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2026487",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
    },
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      "tags": [
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        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://lkml.org/lkml/2021/9/17/1037",
      "tags": [
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        "Mailing List",
        "Patch",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2026487",
      "tags": [
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        "Third Party Advisory"
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        "Patch",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-354"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-354"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem."
    },
    {
      "lang": "es",
      "value": "Se encontró una vulnerabilidad en la función block_invalidatepage del kernel de Linux en el archivo fs/buffer.c en el sistema de archivos. Una falta de comprobación de saneo puede permitir a un atacante local con privilegios de usuario causar un problema de denegación de servicio (DOS)"
    }
  ],
  "lastModified": "2026-06-17T04:19:07.113",
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  "sourceIdentifier": "secalert@redhat.com"
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