fkie_cve-2022-48817
Vulnerability from fkie_nvd
Published
2024-07-16 12:15
Modified
2025-10-06 17:08
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: net: dsa: ar9331: register the mdiobus under devres As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The ar9331 is an MDIO device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the ar9331 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The ar9331 driver doesn't have a complex code structure for mdiobus removal, so just replace of_mdiobus_register with the devres variant in order to be all-devres and ensure that we don't free a still-registered bus.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.17
linux linux_kernel 5.17
linux linux_kernel 5.17


To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: ar9331: register the mdiobus under devres\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don\u0027t allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() \u003c-\ndevres_release_all() \u003c- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe ar9331 is an MDIO device, so the initial set of constraints that I\nthought would cause this (I2C or SPI buses which call -\u003eremove on\n-\u003eshutdown) do not apply. But there is one more which applies here.\n\nIf the DSA master itself is on a bus that calls -\u003eremove from -\u003eshutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the ar9331 switch driver on shutdown.\n\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don\u0027t use devres at all.\n\nThe ar9331 driver doesn\u0027t have a complex code structure for mdiobus\nremoval, so just replace of_mdiobus_register with the devres variant in\norder to be all-devres and ensure that we don\u0027t free a still-registered\nbus."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net: dsa: ar9331: registrar el mdiobus en devres Como se explica en commits: 74b6d7d13307 (\"net: dsa: realtek: registrar el bus MDIO en devres\") 5135e96a3dd2 (\"net: dsa: no asigne el Slave_mii_bus usando devres\") mdiobus_free() entrar\u00e1 en p\u00e1nico cuando se llame desde devm_mdiobus_free() \u0026lt;- devres_release_all() \u0026lt;- __device_release_driver(), y ese mdiobus no fue anulado previamente. El ar9331 es un dispositivo MDIO, por lo que el conjunto inicial de restricciones que pens\u00e9 que causar\u00edan esto (buses I2C o SPI que llaman -\u0026gt;eliminar en -\u0026gt;apagar) no se aplican. Pero hay algo m\u00e1s que se aplica aqu\u00ed. Si el maestro DSA est\u00e1 en un bus que llama -\u0026gt;remove from -\u0026gt;shutdown (como dpaa2-eth, que est\u00e1 en el bus fsl-mc), hay un enlace de dispositivo entre el conmutador y el maestro DSA, y device_links_unbind_consumers( ) desvincular\u00e1 el controlador del interruptor ar9331 al apagar. Por lo tanto, se debe aplicar el mismo tratamiento a todos los controladores de conmutador DSA, que es: usar devres tanto para la asignaci\u00f3n como para el registro de mdiobus, o no usar devres en absoluto. El controlador ar9331 no tiene una estructura de c\u00f3digo compleja para la eliminaci\u00f3n de mdiobus, as\u00ed que simplemente reemplace of_mdiobus_register con la variante devres para que sea todo devres y garantizar que no liberemos un bus a\u00fan registrado."
    }
  ],
  "id": "CVE-2022-48817",
  "lastModified": "2025-10-06T17:08:46.467",
  "metrics": {
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        "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"
      }
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  "published": "2024-07-16T12:15:05.747",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
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}


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