fkie_cve-2021-47416
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
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 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
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                     vulnerable: true,
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                     vulnerable: true,
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                     vulnerable: true,
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               negate: false,
               operator: "OR",
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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->state 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 resolvió la siguiente vulnerabilidad: phy: mdio: arreglar pérdida de memoria. Syzbot informó una pérdida de memoria en la interfaz del bus MDIO, el problema estaba en una lógica de estado incorrecta. MDIOBUS_ALLOCATED indica 2 estados: 1. El bus solo está asignado 2. El bus asignado y __mdiobus_register() falla, pero se llamó 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->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: {
      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: "2024-05-21T15:15:27.083",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         ],
         url: "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         ],
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      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         url: "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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         url: "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f",
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         url: "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988",
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-401",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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