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CVE-2022-48817 (GCVE-0-2022-48817)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:44 – Updated: 2026-05-11 18:47
VLAI
Title
net: dsa: ar9331: register the mdiobus under devres
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:58 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < 475ce5dcf2d88fd4f3c213a0ac944e3e40702970 (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < aae1c6a1d3d696fc33b609fb12fe744a556d1dc5 (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < f1842a8cb71de4d7eb75a86f76e88c7ee739218c (git)
Affected: ac3a68d56651c3dad2c12c7afce065fe15267f44 , < 50facd86e9fbc4b93fe02e5fe05776047f45dbfb (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "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": "2026-06-17T05:16:16.360",
        "metrics": {
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                "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",
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                "timestamp": "2024-09-10T16:58:12.493038Z",
                "version": "2.0.3"
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        "published": "2024-07-16T12:15:05.747",
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        "vulnStatus": "Analyzed",
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                "value": "NVD-CWE-noinfo"
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            ],
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    },
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      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T10:44:37+00:00",
      "cve": "CVE-2022-48817",
      "id": "CVE-2022-48817",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "150",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: dsa: ar9331: register the mdiobus under devres",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48817.json",
      "version": "3"
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      "product_status:known_affected": "295",
      "product_status:known_not_affected": "254",
      "product_status:recommended": "426",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48817",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48817.json",
      "version": "51"
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              "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."
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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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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.