GHSA-HX96-9F4R-RWCP

Vulnerability from github – Published: 2024-08-17 12:30 – Updated: 2025-11-04 00:31
VLAI?
Details

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

ext4: fix infinite loop when replaying fast_commit

When doing fast_commit replay an infinite loop may occur due to an uninitialized extent_status struct. ext4_ext_determine_insert_hole() does not detect the replay and calls ext4_es_find_extent_range(), which will return immediately without initializing the 'es' variable.

Because 'es' contains garbage, an integer overflow may happen causing an infinite loop in this function, easily reproducible using fstest generic/039.

This commit fixes this issue by unconditionally initializing the structure in function ext4_es_find_extent_range().

Thanks to Zhang Yi, for figuring out the real problem!

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-43828"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-17T10:15:08Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix infinite loop when replaying fast_commit\n\nWhen doing fast_commit replay an infinite loop may occur due to an\nuninitialized extent_status struct.  ext4_ext_determine_insert_hole() does\nnot detect the replay and calls ext4_es_find_extent_range(), which will\nreturn immediately without initializing the \u0027es\u0027 variable.\n\nBecause \u0027es\u0027 contains garbage, an integer overflow may happen causing an\ninfinite loop in this function, easily reproducible using fstest generic/039.\n\nThis commit fixes this issue by unconditionally initializing the structure\nin function ext4_es_find_extent_range().\n\nThanks to Zhang Yi, for figuring out the real problem!",
  "id": "GHSA-hx96-9f4r-rwcp",
  "modified": "2025-11-04T00:31:15Z",
  "published": "2024-08-17T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43828"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0619f7750f2b178a1309808832ab20d85e0ad121"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/181e63cd595c688194e07332f9944b3a63193de2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ed0496e383cb6de120e56991385dce70bbb87c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81f819c537d29932e4b9267f02411cbc8b355178"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/907c3fe532253a6ef4eb9c4d67efb71fab58c706"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6e67df64783e99a657ef2b8c834ba2bf54c539c"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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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