fkie_cve-2022-48961
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-10-24 20:02
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: mdio: fix unbalanced fwnode reference count in mdio_device_release() There is warning report about of_node refcount leak while probing mdio device: OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4 In of_mdiobus_register_device(), we increase fwnode refcount by fwnode_handle_get() before associating the of_node with mdio device, but it has never been decreased in normal path. Since that, in mdio_device_release(), it needs to call fwnode_handle_put() in addition instead of calling kfree() directly. After above, just calling mdio_device_free() in the error handle path of of_mdiobus_register_device() is enough to keep the refcount balanced.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16854177745a5648f8ec322353b432e18460f43aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb37617687f2bfa5b675df7779f869147c9002bdPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


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   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: fix unbalanced fwnode reference count in mdio_device_release()\n\nThere is warning report about of_node refcount leak\nwhile probing mdio device:\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry:\nattach overlay node /spi/soc@0/mdio@710700c0/ethernet@4\n\nIn of_mdiobus_register_device(), we increase fwnode refcount\nby fwnode_handle_get() before associating the of_node with\nmdio device, but it has never been decreased in normal path.\nSince that, in mdio_device_release(), it needs to call\nfwnode_handle_put() in addition instead of calling kfree()\ndirectly.\n\nAfter above, just calling mdio_device_free() in the error handle\npath of of_mdiobus_register_device() is enough to keep the\nrefcount balanced.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mdio: arregla el recuento de referencias de fwnode no balanceado en mdio_device_release() Hay un informe de advertencia sobre una fuga de recuento de referencias de of_node mientras se sondea el dispositivo mdio: OF: ERROR: fuga de memoria, se esperaba un recuento de referencias de 1 en lugar de 2, of_node_get()/of_node_put() no balanceado - destruye la entrada de cset: adjunta el nodo superpuesto /spi/soc@0/mdio@710700c0/ethernet@4 En of_mdiobus_register_device(), aumentamos el recuento de referencias de fwnode mediante fwnode_handle_get() antes de asociar el of_node con el dispositivo mdio, pero nunca se ha reducido en la ruta normal. Desde entonces, en mdio_device_release(), necesita llamar a fwnode_handle_put() además en lugar de llamar a kfree() directamente. Después de lo anterior, simplemente llamar a mdio_device_free() en la ruta del controlador de errores de of_mdiobus_register_device() es suficiente para mantener el recuento de referencias equilibrado.",
      },
   ],
   id: "CVE-2022-48961",
   lastModified: "2024-10-24T20:02:22.347",
   metrics: {
      cvssMetricV31: [
         {
            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",
         },
      ],
   },
   published: "2024-10-21T20:15:07.887",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/16854177745a5648f8ec322353b432e18460f43a",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "NVD-CWE-Other",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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