GHSA-24GV-QFV8-V7F5

Vulnerability from github – Published: 2024-10-21 18:30 – Updated: 2025-11-04 00:31
VLAI?
Details

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

ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free

When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(), the 'ppath' is updated but it is the 'path' that is freed, thus potentially triggering a double-free in the following process:

ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(&ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path) ---> path First freed *orig_path = path = NULL ---> null ppath kfree(path) ---> path double-free !!!

So drop the unnecessary ppath and use path directly to avoid this problem. And use ext4_find_extent() directly to update path, avoiding unnecessary memory allocation and freeing. Also, propagate the error returned by ext4_find_extent() instead of using strange error codes.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-49983"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-415"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:18Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\n\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\ntriggering a double-free in the following process:\n\next4_ext_replay_update_ex\n  ppath = path\n  ext4_force_split_extent_at(\u0026ppath)\n    ext4_split_extent_at\n      ext4_ext_insert_extent\n        ext4_ext_create_new_leaf\n          ext4_ext_grow_indepth\n            ext4_find_extent\n              if (depth \u003e path[0].p_maxdepth)\n                kfree(path)                 ---\u003e path First freed\n                *orig_path = path = NULL    ---\u003e null ppath\n  kfree(path)                               ---\u003e path double-free !!!\n\nSo drop the unnecessary ppath and use path directly to avoid this problem.\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\nmemory allocation and freeing. Also, propagate the error returned by\next4_find_extent() instead of using strange error codes.",
  "id": "GHSA-24gv-qfv8-v7f5",
  "modified": "2025-11-04T00:31:44Z",
  "published": "2024-10-21T18:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49983"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "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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