« Volver al listado

CVE-2024-47674

Estado: ModificadaMedia (5.5)—

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

mm: avoid leaving partial pfn mappings around in error case

As Jann points out, PFN mappings are special, because unlike normal memory mappings, there is no lifetime information associated with the mapping - it is just a raw mapping of PFNs with no reference counting of a 'struct page'.

That's all very much intentional, but it does mean that it's easy to mess up the cleanup in case of errors. Yes, a failed mmap() will always eventually clean up any partial mappings, but without any explicit lifetime in the page table mapping itself, it's very easy to do the error handling in the wrong order.

Leer descripción completaMostrar menos

In particular, it's easy to mistakenly free the physical backing store before the page tables are actually cleaned up and (temporarily) have stale dangling PTE entries.

To make this situation less error-prone, just make sure that any partial pfn mapping is torn down early, before any other error handling.

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-47674",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-47674",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-10-15T12:44:14.464782Z"
        }
      }
    ],
    "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
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "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": "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": "b97a50adb37e98b940a30c4656565ff609aa8f94",
              "lessThan": "3213fdcab961026203dd587a4533600c70b3336b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "69d4e1ce9087c8767f2fe9b9426fa2755c8e9072",
              "lessThan": "35770ca6180caa24a2b258c99a87bd437a1ee10f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74ffa5a3e68504dd289135b1cf0422c19ffb3f2e",
              "lessThan": "5b2c8b34f6d76bfbd1dd4936eb8a0fbfb9af3959",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74ffa5a3e68504dd289135b1cf0422c19ffb3f2e",
              "lessThan": "65d0db500d7c07f0f76fc24a4d837791c4862cd2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74ffa5a3e68504dd289135b1cf0422c19ffb3f2e",
              "lessThan": "a95a24fcaee1b892e47d5e6dcc403f713874ee80",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74ffa5a3e68504dd289135b1cf0422c19ffb3f2e",
              "lessThan": "954fd4c81f22c4b6ba65379a81fd252971bf4ef3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74ffa5a3e68504dd289135b1cf0422c19ffb3f2e",
              "lessThan": "79a61cc3fc0466ad2b7b89618a6157785f0293b3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "mm/memory.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": "5.15.168",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.10.11",
              "versionType": "semver",
              "lessThanOrEqual": "6.10.*"
            },
            {
              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "mm/memory.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-10-15T11:15:13.073",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3213fdcab961026203dd587a4533600c70b3336b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/35770ca6180caa24a2b258c99a87bd437a1ee10f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b2c8b34f6d76bfbd1dd4936eb8a0fbfb9af3959",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/65d0db500d7c07f0f76fc24a4d837791c4862cd2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/79a61cc3fc0466ad2b7b89618a6157785f0293b3",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/954fd4c81f22c4b6ba65379a81fd252971bf4ef3",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a95a24fcaee1b892e47d5e6dcc403f713874ee80",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://project-zero.issues.chromium.org/issues/366053091",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-459"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: avoid leaving partial pfn mappings around in error case\n\nAs Jann points out, PFN mappings are special, because unlike normal\nmemory mappings, there is no lifetime information associated with the\nmapping - it is just a raw mapping of PFNs with no reference counting of\na 'struct page'.\n\nThat's all very much intentional, but it does mean that it's easy to\nmess up the cleanup in case of errors.  Yes, a failed mmap() will always\neventually clean up any partial mappings, but without any explicit\nlifetime in the page table mapping itself, it's very easy to do the\nerror handling in the wrong order.\n\nIn particular, it's easy to mistakenly free the physical backing store\nbefore the page tables are actually cleaned up and (temporarily) have\nstale dangling PTE entries.\n\nTo make this situation less error-prone, just make sure that any partial\npfn mapping is torn down early, before any other error handling."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: evitar dejar asignaciones pfn parciales en caso de error Como señala Jann, las asignaciones PFN son especiales, porque a diferencia de las asignaciones de memoria normales, no hay información de duración asociada con la asignación: es solo una asignación sin procesar de PFN sin recuento de referencias de una 'página de estructura'. Todo eso es muy intencional, pero significa que es fácil arruinar la limpieza en caso de errores. Sí, un mmap() fallido siempre limpiará eventualmente cualquier asignación parcial, pero sin ninguna duración explícita en la asignación de la tabla de páginas en sí, es muy fácil hacer el manejo de errores en el orden incorrecto. En particular, es fácil liberar por error el almacenamiento de respaldo físico antes de que las tablas de páginas se limpien realmente y (temporalmente) tengan entradas PTE colgantes obsoletas. Para hacer que esta situación sea menos propensa a errores, simplemente asegúrese de que cualquier asignación pfn parcial se elimine temprano, antes de cualquier otro manejo de errores."
    }
  ],
  "lastModified": "2026-08-04T11:20:38.190",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F032D82B-5582-4DF5-B921-BFE0BD301364",
              "versionEndExcluding": "5.15.168"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FCBCD375-91FC-4790-94C0-6FF9C68F6498",
              "versionEndExcluding": "6.1.111",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "02ADDA94-95BB-484D-8E95-63C0428A28E3",
              "versionEndExcluding": "6.6.52",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F5DB5367-F1F5-4200-B3B3-FDF8AFC3D255",
              "versionEndExcluding": "6.10.11",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "39889A68-6D34-47A6-82FC-CD0BF23D6754"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B8383ABF-1457-401F-9B61-EE50F4C61F4F"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B77A9280-37E6-49AD-B559-5B23A3B1DC3D"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DE5298B3-04B4-4F3E-B186-01A58B5C75A6"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}