fkie_cve-2021-46959
Vulnerability from fkie_nvd
Published
2024-02-29 23:15
Modified
2024-12-10 17:55
Summary
In the Linux kernel, the following vulnerability has been resolved: spi: Fix use-after-free with devm_spi_alloc_* We can't rely on the contents of the devres list during spi_unregister_controller(), as the list is already torn down at the time we perform devres_find() for devm_spi_release_controller. This causes devices registered with devm_spi_alloc_{master,slave}() to be mistakenly identified as legacy, non-devm managed devices and have their reference counters decremented below 0. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98) [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24) r4:b6700140 [<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40) [<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (device_driver_detach) from [<b044d274>] (unbind_store+0xe4/0xf8) Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7Patch



{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: Fix use-after-free with devm_spi_alloc_*\n\nWe can\u0027t rely on the contents of the devres list during\nspi_unregister_controller(), as the list is already torn down at the\ntime we perform devres_find() for devm_spi_release_controller. This\ncauses devices registered with devm_spi_alloc_{master,slave}() to be\nmistakenly identified as legacy, non-devm managed devices and have their\nreference counters decremented below 0.\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174\n[\u003cb0396f04\u003e] (refcount_warn_saturate) from [\u003cb03c56a4\u003e] (kobject_put+0x90/0x98)\n[\u003cb03c5614\u003e] (kobject_put) from [\u003cb0447b4c\u003e] (put_device+0x20/0x24)\n r4:b6700140\n[\u003cb0447b2c\u003e] (put_device) from [\u003cb07515e8\u003e] (devm_spi_release_controller+0x3c/0x40)\n[\u003cb07515ac\u003e] (devm_spi_release_controller) from [\u003cb045343c\u003e] (release_nodes+0x84/0xc4)\n r5:b6700180 r4:b6700100\n[\u003cb04533b8\u003e] (release_nodes) from [\u003cb0454160\u003e] (devres_release_all+0x5c/0x60)\n r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10\n[\u003cb0454104\u003e] (devres_release_all) from [\u003cb044e41c\u003e] (__device_release_driver+0x144/0x1ec)\n r5:b117ad94 r4:b163dc10\n[\u003cb044e2d8\u003e] (__device_release_driver) from [\u003cb044f70c\u003e] (device_driver_detach+0x84/0xa0)\n r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10\n[\u003cb044f688\u003e] (device_driver_detach) from [\u003cb044d274\u003e] (unbind_store+0xe4/0xf8)\n\nInstead, determine the devm allocation state as a flag on the\ncontroller which is guaranteed to be stable during cleanup."
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: corrige el Use-After-Free con devm_spi_alloc_* No podemos confiar en el contenido de la lista devres durante spi_unregister_controller(), ya que la lista ya est\u00e1 eliminada en ese momento. Realizamos devres_find() para devm_spi_release_controller. Esto hace que los dispositivos registrados con devm_spi_alloc_{master,slave}() se identifiquen err\u00f3neamente como dispositivos heredados, no administrados por devm y sus contadores de referencia disminuyan por debajo de 0. ------------[ cortar aqu\u00ed ] ------------ ADVERTENCIA: CPU: 1 PID: 660 en lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [] (refcount_warn_saturate) de [] (kobject_put+ 0x90/0x98) [] (kobject_put) de [] (put_device+0x20/0x24) r4:b6700140 [] (put_device) de [] (devm_spi_release_controller+0x3c/0x40 ) [ ] (devm_spi_release_controller) de [] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [] (release_nodes) de [] (devres_release_all+0x5c/0x6 0) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [] (devres_release_all) de [] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [] (__device_release_driver) de [\u0026lt; b044f70c\u0026gt;] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [] (device_driver_detach) de [ ] (unbind_store+0xe4/0xf8) en su lugar , determine el estado de asignaci\u00f3n devm como un indicador en el controlador que se garantiza que ser\u00e1 estable durante la limpieza."
    }
  ],
  "id": "CVE-2021-46959",
  "lastModified": "2024-12-10T17:55:18.607",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-02-29T23:15:07.230",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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