fkie_cve-2021-47334
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2024-12-26 19:25
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/libmasm/module: Fix two use after free in ibmasm_init_one\n\nIn ibmasm_init_one, it calls ibmasm_init_remote_input_dev().\nInside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are\nallocated by input_allocate_device(), and assigned to\nsp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev respectively.\n\nIn the err_free_devices error branch of ibmasm_init_one,\nmouse_dev and keybd_dev are freed by input_free_device(), and return\nerror. Then the execution runs into error_send_message error branch\nof ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called\nto unregister the freed sp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev.\n\nMy patch add a \"error_init_remote\" label to handle the error of\nibmasm_init_remote_input_dev(), to avoid the uaf bugs."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc/libmasm/module: corrige dos use after free en ibmasm_init_one. En ibmasm_init_one, llama a ibmasm_init_remote_input_dev(). Dentro de ibmasm_init_remote_input_dev, mouse_dev y keybd_dev son asignados por input_allocate_device() y asignados a sp-\u0026gt;remote.mouse_dev y sp-\u0026gt;remote.keybd_dev respectivamente. En la rama de error err_free_devices de ibmasm_init_one, mouse_dev y keybd_dev se liberan mediante input_free_device() y devuelven un error. Luego, la ejecuci\u00f3n se ejecuta en la rama de error error_send_message de ibmasm_init_one, donde se llama a ibmasm_free_remote_input_dev(sp) para cancelar el registro de sp-\u0026gt;remote.mouse_dev y sp-\u0026gt;remote.keybd_dev liberados. Mi parche agrega una etiqueta \"error_init_remote\" para manejar el error de ibmasm_init_remote_input_dev(), para evitar los errores de uaf."
    }
  ],
  "id": "CVE-2021-47334",
  "lastModified": "2024-12-26T19:25:16.993",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
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  "published": "2024-05-21T15:15:20.273",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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