ghsa-gq92-c2vh-pqwx
Vulnerability from github
Published
2025-10-24 18:30
Modified
2025-10-24 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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
Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49688"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:43Z",
    "severity": "MODERATE"
  },
  "details": "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",
  "id": "GHSA-gq92-c2vh-pqwx",
  "modified": "2025-10-24T18:30:56Z",
  "published": "2025-10-24T18:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49688"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b2bba96526f25f2eba74ecadb031de2e05a83ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65c24caf1b9f5b08397c6e805ec24ebc390c6e4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7844ceada44eca740d31beb3d97b8511b1ca0a9b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b564e3254b7db5fbfbf11a824627a6c31b932b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb78d1b5efffe4cf97e16766329dd7358aed3deb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3a232e5767051483ffad4cef7d0a89d292a192b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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