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CVE-2022-49849

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix match incorrectly in dev_args_match_device

syzkaller found a failed assertion:

This can be triggered when we set devid to (u64)-1 by ioctl. In this case, the match of devid will be skipped and the match of device may succeed incorrectly.

Patch 562d7b1512f7 introduced this function which is used to match device. This function contains two matching scenarios, we can distinguish them by checking the value of args->missing rather than check whether args->devid and args->uuid is default value.

Detalles técnicos trazas, registros y código del informe original
  assertion failed: (args->devid != (u64)-1) || args->missing, in fs/btrfs/volumes.c:6921

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2022-49849",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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          "programFiles": [
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  "published": "2025-05-01T15:16:08.450",
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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix match incorrectly in dev_args_match_device\n\nsyzkaller found a failed assertion:\n\n  assertion failed: (args->devid != (u64)-1) || args->missing, in fs/btrfs/volumes.c:6921\n\nThis can be triggered when we set devid to (u64)-1 by ioctl. In this\ncase, the match of devid will be skipped and the match of device may\nsucceed incorrectly.\n\nPatch 562d7b1512f7 introduced this function which is used to match device.\nThis function contains two matching scenarios, we can distinguish them by\nchecking the value of args->missing rather than check whether args->devid\nand args->uuid is default value."
    },
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: corrección de coincidencia incorrecta en dev_args_match_device syzkaller encontró una aserción fallida: assertion failed: (args->devid != (u64)-1) || args->missing, en fs/btrfs/volumes.c:6921 Esto puede activarse cuando configuramos devid en (u64)-1 mediante ioctl. En este caso, se omitirá la coincidencia de devid y la coincidencia de dispositivo puede tener éxito incorrectamente. El parche 562d7b1512f7 introdujo esta función que se utiliza para hacer coincidir dispositivos. Esta función contiene dos escenarios de coincidencia; podemos distinguirlos comprobando el valor de args->missing en lugar de comprobar si args->devid y args->uuid son los valores predeterminados."
    }
  ],
  "lastModified": "2026-06-17T05:19:18.053",
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