CVE-2022-49688

Estado: AnalizadaMedia (5.5)—

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

afs: Fix dynamic root getattr

The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd.

Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr().

This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like:

Detalles técnicos trazas, registros y código del informe original

        BUG: kernel NULL pointer dereference, address: 0000000000000020
        ...
        RIP: 0010:afs_getattr+0x8b/0x14b
        ...
        Call Trace:
         <TASK>
         vfs_statx+0x79/0xf5
         vfs_fstatat+0x49/0x62

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.30%
Percentil entre todas las CVEs puntuadas: 21
Fecha de la puntuación: 6/10/2026

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

CWE-476

Referencias

JSON original (NVD)

Mostrar

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          "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",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix dynamic root getattr\n\nThe recent patch to make afs_getattr consult the server didn't account\nfor the pseudo-inodes employed by the dynamic root-type afs superblock\nnot having a volume or a server to access, and thus an oops occurs if\nsuch a directory is stat'd.\n\nFix this by checking to see if the vnode->volume pointer actually points\nanywhere before following it in afs_getattr().\n\nThis can be tested by stat'ing a directory in /afs.  It may be\nsufficient just to do \"ls /afs\" and the oops looks something like:\n\n        BUG: kernel NULL pointer dereference, address: 0000000000000020\n        ...\n        RIP: 0010:afs_getattr+0x8b/0x14b\n        ...\n        Call Trace:\n         <TASK>\n         vfs_statx+0x79/0xf5\n         vfs_fstatat+0x49/0x62"
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: Fix dynamic root getattr El parche reciente para hacer que afs_getattr consulte al servidor no tuvo en cuenta los pseudoinodos empleados por el superbloque afs de tipo raíz dinámico que no tienen un volumen o un servidor al que acceder, y por lo tanto ocurre un error si se agrega una estadística a dicho directorio. Arregle esto verificando si el puntero vnode-&gt;volume realmente apunta a algún lugar antes de seguirlo en afs_getattr(). Esto se puede probar agregando una estadística a un directorio en /afs. Puede ser suficiente con hacer \"ls /afs\" y el error se verá así: ERROR: desreferencia de puntero NULL del núcleo, dirección: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Seguimiento de llamadas:  vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62"
    }
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