fkie_cve-2022-49873
Vulnerability from fkie_nvd
Published
2025-05-01 15:16
Modified
2025-05-07 13:21
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


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{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "91F46A95-7482-4E48-87C2-CFB90EFA6AAE",
              "versionEndExcluding": "5.10.155",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "39DC45D8-E30E-4F4A-9332-393B7BCF6900",
              "versionEndExcluding": "5.15.79",
              "versionStartIncluding": "5.11",
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            },
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C3F26709-7D49-4AF0-8145-46CCF4E8E2AD",
              "versionEndExcluding": "6.0.9",
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              "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B",
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          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix wrong reg type conversion in release_reference()\n\nSome helper functions will allocate memory. To avoid memory leaks, the\nverifier requires the eBPF program to release these memories by calling\nthe corresponding helper functions.\n\nWhen a resource is released, all pointer registers corresponding to the\nresource should be invalidated. The verifier use release_references() to\ndo this job, by apply  __mark_reg_unknown() to each relevant register.\n\nIt will give these registers the type of SCALAR_VALUE. A register that\nwill contain a pointer value at runtime, but of type SCALAR_VALUE, which\nmay allow the unprivileged user to get a kernel pointer by storing this\nregister into a map.\n\nUsing __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this\nproblem."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Arreglar conversi\u00f3n de tipo de registro incorrecta en release_reference() Algunas funciones auxiliares asignar\u00e1n memoria. Para evitar fugas de memoria, el verificador requiere que el programa eBPF libere estas memorias llamando a las funciones auxiliares correspondientes. Cuando se libera un recurso, todos los registros de puntero correspondientes al recurso deben invalidarse. El verificador usa release_references() para realizar este trabajo, aplicando __mark_reg_unknown() a cada registro relevante. Les dar\u00e1 a estos registros el tipo SCALAR_VALUE. Un registro que contendr\u00e1 un valor de puntero en tiempo de ejecuci\u00f3n, pero de tipo SCALAR_VALUE, puede permitir que el usuario sin privilegios obtenga un puntero del kernel almacenando este registro en un mapa. Usar __mark_reg_not_init() mientras NO allow_ptr_leaks puede mitigar este problema."
    }
  ],
  "id": "CVE-2022-49873",
  "lastModified": "2025-05-07T13:21:56.420",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T15:16:12.240",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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      "tags": [
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      "url": "https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-704"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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