FKIE_CVE-2021-47416

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2024-12-31 18:53
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: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6Patch
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 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t   device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus-\u003estate to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: phy: mdio: arreglar p\u00e9rdida de memoria. Syzbot inform\u00f3 una p\u00e9rdida de memoria en la interfaz del bus MDIO, el problema estaba en una l\u00f3gica de estado incorrecta. MDIOBUS_ALLOCATED indica 2 estados: 1. El bus solo est\u00e1 asignado 2. El bus asignado y __mdiobus_register() falla, pero se llam\u00f3 a device_register() En caso de que se haya llamado a device_register() debemos llamar a put_device() para liberar correctamente la memoria asignada para esto dispositivo, pero mdiobus_free() llama solo a kfree(dev) en caso de estado MDIOBUS_ALLOCATED. Para evitar este comportamiento, necesitamos configurar bus-\u0026gt;state en MDIOBUS_UNREGISTERED _antes_ de llamar a device_register(), porque put_device() debe llamarse incluso en caso de fallo de device_register( ."
    }
  ],
  "id": "CVE-2021-47416",
  "lastModified": "2024-12-31T18:53:18.000",
  "metrics": {
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          "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"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-21T15:15:27.083",
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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