ghsa-xmg9-vq9f-g4cr
Vulnerability from github
Published
2025-01-15 15:31
Modified
2025-02-02 12:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

ocfs2: fix slab-use-after-free due to dangling pointer dqi_priv

When mounting ocfs2 and then remounting it as read-only, a slab-use-after-free occurs after the user uses a syscall to quota_getnextquota. Specifically, sb_dqinfo(sb, type)->dqi_priv is the dangling pointer.

During the remounting process, the pointer dqi_priv is freed but is never set as null leaving it to be accessed. Additionally, the read-only option for remounting sets the DQUOT_SUSPENDED flag instead of setting the DQUOT_USAGE_ENABLED flags. Moreover, later in the process of getting the next quota, the function ocfs2_get_next_id is called and only checks the quota usage flags and not the quota suspended flags.

To fix this, I set dqi_priv to null when it is freed after remounting with read-only and put a check for DQUOT_SUSPENDED in ocfs2_get_next_id.

[akpm@linux-foundation.org: coding-style cleanups]

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{
  "affected": [],
  "aliases": [
    "CVE-2024-57892"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-15T13:15:13Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix slab-use-after-free due to dangling pointer dqi_priv\n\nWhen mounting ocfs2 and then remounting it as read-only, a\nslab-use-after-free occurs after the user uses a syscall to\nquota_getnextquota.  Specifically, sb_dqinfo(sb, type)-\u003edqi_priv is the\ndangling pointer.\n\nDuring the remounting process, the pointer dqi_priv is freed but is never\nset as null leaving it to be accessed.  Additionally, the read-only option\nfor remounting sets the DQUOT_SUSPENDED flag instead of setting the\nDQUOT_USAGE_ENABLED flags.  Moreover, later in the process of getting the\nnext quota, the function ocfs2_get_next_id is called and only checks the\nquota usage flags and not the quota suspended flags.\n\nTo fix this, I set dqi_priv to null when it is freed after remounting with\nread-only and put a check for DQUOT_SUSPENDED in ocfs2_get_next_id.\n\n[akpm@linux-foundation.org: coding-style cleanups]",
  "id": "GHSA-xmg9-vq9f-g4cr",
  "modified": "2025-02-02T12:30:24Z",
  "published": "2025-01-15T15:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57892"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d431192486367eee03cc28d0b53b97dafcb8e63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e3d203b1adede46bbba049e497765d67865be18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58f9e20e2a7602e1dd649a1ec4790077c251cb6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f3fd772d152229d94602bca243fbb658068a597"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ff6f635a08c30559ded0c110c7ce03ba7747d11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba950a02d8d23811aa1120affd3adedcfac6153d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f44e6d70c100614c211703f065cad448050e4a0e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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