fkie_cve-2022-49688
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-10-24 15:51
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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: BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3debPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.18
linux linux_kernel 5.19
linux linux_kernel 5.19
linux linux_kernel 5.19


To clipboard 

{
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    {
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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\u0027t 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\u0027d.\n\nFix this by checking to see if the vnode-\u003evolume pointer actually points\nanywhere before following it in afs_getattr().\n\nThis can be tested by stat\u0027ing 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         \u003cTASK\u003e\n         vfs_statx+0x79/0xf5\n         vfs_fstatat+0x49/0x62"
    },
    {
      "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 ra\u00edz din\u00e1mico que no tienen un volumen o un servidor al que acceder, y por lo tanto ocurre un error si se agrega una estad\u00edstica a dicho directorio. Arregle esto verificando si el puntero vnode-\u0026gt;volume realmente apunta a alg\u00fan lugar antes de seguirlo en afs_getattr(). Esto se puede probar agregando una estad\u00edstica a un directorio en /afs. Puede ser suficiente con hacer \"ls /afs\" y el error se ver\u00e1 as\u00ed: ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Seguimiento de llamadas:  vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62"
    }
  ],
  "id": "CVE-2022-49688",
  "lastModified": "2025-10-24T15:51:13.817",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-02-26T07:01:43.617",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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