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nvd-json-data-feeds/CVE-2021/CVE-2021-472xx/CVE-2021-47280.json
cad-safe-bot 7ce81bf38d Auto-Update: 2024-12-24T17:00:20.670334+00:00
2024-12-24 17:03:42 +00:00

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{
"id": "CVE-2021-47280",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-05-21T15:15:16.277",
"lastModified": "2024-12-24T16:31:41.267",
"vulnStatus": "Analyzed",
"cveTags": [],
"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->master prior to locking the device's 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's master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv->master in\ndrm_new_set_master(). The old value of fpriv->master was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device's master mutex before retrieving the\npointer from from fpriv->master. 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. ->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->master en drm_new_set_master(). El antiguo valor de fpriv->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->master. Este parche pasa la prueba del reproductor Syzbot."
}
],
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{
"source": "nvd@nist.gov",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "HIGH",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.0,
"impactScore": 5.9
}
]
},
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{
"source": "nvd@nist.gov",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-367"
},
{
"lang": "en",
"value": "CWE-416"
}
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