CVE-2025-68251 (GCVE-0-2025-68251)
Vulnerability from cvelistv5
Published
2025-12-16 14:32
Modified
2025-12-16 14:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: avoid infinite loops due to corrupted subpage compact indexes Robert reported an infinite loop observed by two crafted images. The root cause is that `clusterofs` can be larger than `lclustersize` for !NONHEAD `lclusters` in corrupted subpage compact indexes, e.g.: blocksize = lclustersize = 512 lcn = 6 clusterofs = 515 Move the corresponding check for full compress indexes to `z_erofs_load_lcluster_from_disk()` to also cover subpage compact compress indexes. It also fixes the position of `m->type >= Z_EROFS_LCLUSTER_TYPE_MAX` check, since it should be placed right after `z_erofs_load_{compact,full}_lcluster()`.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea
Version: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea
Version: 3f691aa676f29586e83e6c032713554a290418c3
Version: 22438a34d383ec2789eaf450728e38abc53051f8
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "fs/erofs/zmap.c"
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          "vendor": "Linux",
          "versions": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: avoid infinite loops due to corrupted subpage compact indexes\n\nRobert reported an infinite loop observed by two crafted images.\n\nThe root cause is that `clusterofs` can be larger than `lclustersize`\nfor !NONHEAD `lclusters` in corrupted subpage compact indexes, e.g.:\n\n  blocksize = lclustersize = 512   lcn = 6   clusterofs = 515\n\nMove the corresponding check for full compress indexes to\n`z_erofs_load_lcluster_from_disk()` to also cover subpage compact\ncompress indexes.\n\nIt also fixes the position of `m-\u003etype \u003e= Z_EROFS_LCLUSTER_TYPE_MAX`\ncheck, since it should be placed right after\n`z_erofs_load_{compact,full}_lcluster()`."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T14:32:17.979Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8675447a8794983f2b7e694b378112772c17635e"
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        {
          "url": "https://git.kernel.org/stable/c/e13d315ae077bb7c3c6027cc292401bc0f4ec683"
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      ],
      "title": "erofs: avoid infinite loops due to corrupted subpage compact indexes",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68251",
    "datePublished": "2025-12-16T14:32:17.979Z",
    "dateReserved": "2025-12-16T13:41:40.266Z",
    "dateUpdated": "2025-12-16T14:32:17.979Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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