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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
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."
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        "id": "CVE-2022-48817",
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      "product_status:known_affected": "151",
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      "title": "kernel: net: dsa: ar9331: register the mdiobus under devres",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48817",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2024/cve-2022-48817.json",
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}



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