FKIE_CVE-2021-47280

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2024-12-24 16:31
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488ePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix use-after-free read in drm_getunique()\n\nThere is a time-of-check-to-time-of-use error in drm_getunique() due\nto retrieving file_priv-\u003emaster prior to locking the device\u0027s master\nmutex.\n\nAn example can be seen in the crash report of the use-after-free error\nfound by Syzbot:\nhttps://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803\n\nIn the report, the master pointer was used after being freed. This is\nbecause another process had acquired the device\u0027s master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv-\u003emaster in\ndrm_new_set_master(). The old value of fpriv-\u003emaster was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device\u0027s master mutex before retrieving the\npointer from from fpriv-\u003emaster. This patch passes the Syzbot\nreproducer test."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm: corrige la lectura de use after free en drm_getunique(). Hay un error de tiempo de verificaci\u00f3n a tiempo de uso en drm_getunique() debido a la recuperaci\u00f3n de file_priv. -\u0026gt;master antes de bloquear el mutex maestro del dispositivo. Se puede ver un ejemplo en el informe de fallo del error de use after free encontrado por Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 En el informe, el puntero maestro se utiliz\u00f3 despu\u00e9s de ser liberado. Esto se debe a que otro proceso adquiri\u00f3 el mutex maestro del dispositivo en drm_setmaster_ioctl() y luego sobrescribi\u00f3 fpriv-\u0026gt;master en drm_new_set_master(). El antiguo valor de fpriv-\u0026gt;master se liber\u00f3 posteriormente antes de que se desbloqueara el mutex. Para solucionar este problema, bloqueamos el mutex maestro del dispositivo antes de recuperar el puntero desde fpriv-\u0026gt;master. Este parche pasa la prueba del reproductor Syzbot."
    }
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  "id": "CVE-2021-47280",
  "lastModified": "2024-12-24T16:31:41.267",
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          "attackVector": "LOCAL",
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          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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  "published": "2024-05-21T15:15:16.277",
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          "value": "CWE-416"
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      "source": "nvd@nist.gov",
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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