CVE-2025-68251 (GCVE-0-2025-68251)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:32 – Updated: 2026-10-21 12:38
VLAI
Title
erofs: avoid infinite loops due to corrupted subpage compact indexes
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()`.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3f691aa676f29586e83e6c032713554a290418c3 , < b18a82503a67a530d48f5a5b429e162749fe2c89 (git)
Affected: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea , < dbfac1b85d0753996ddfef636934d431b588dd1f (git)
Affected: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea , < 8675447a8794983f2b7e694b378112772c17635e (git)
Affected: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea , < e13d315ae077bb7c3c6027cc292401bc0f4ec683 (git)
Affected: 22438a34d383ec2789eaf450728e38abc53051f8 (git)
Affected: 6.6.16 , < 6.6.160 (semver)
Affected: 6.7.4 , < 6.8 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "fs/erofs/zmap.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
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          "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": "2026-10-21T12:38:08.014Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/b18a82503a67a530d48f5a5b429e162749fe2c89"
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          "url": "https://git.kernel.org/stable/c/dbfac1b85d0753996ddfef636934d431b588dd1f"
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          "url": "https://git.kernel.org/stable/c/8675447a8794983f2b7e694b378112772c17635e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e13d315ae077bb7c3c6027cc292401bc0f4ec683"
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      ],
      "title": "erofs: avoid infinite loops due to corrupted subpage compact indexes",
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    "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": "2026-10-21T12:38:08.014Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-30",
      "epss": "0.00214",
      "percentile": "0.11847"
    },
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      "cve": "CVE-2025-68251",
      "id": "msrc_CVE-2025-68251",
      "initial_release_date": "2026-05-25T01:01:45.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "8",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "erofs: avoid infinite loops due to corrupted subpage compact indexes",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-68251.json",
      "version": "12"
    },
    "nvd": {
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                "product": "Linux",
                "programFiles": [
                  "fs/erofs/zmap.c"
                ],
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                "vendor": "Linux",
                "versions": [
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        "cveTags": [],
        "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()`."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nerofs: evitar bucles infinitos debido a \u00edndices compactos de subp\u00e1gina corruptos\n\nRobert inform\u00f3 de un bucle infinito observado en dos im\u00e1genes manipuladas.\n\nLa causa ra\u00edz es que \u0027clusterofs\u0027 puede ser mayor que \u0027lclustersize\u0027 para \u0027lclusters\u0027 !NONHEAD en \u00edndices compactos de subp\u00e1gina corruptos, p. ej.:\n\nblocksize = lclustersize = 512 lcn = 6 clusterofs = 515\n\nMover la comprobaci\u00f3n correspondiente para \u00edndices de compresi\u00f3n completos a \u0027z_erofs_load_lcluster_from_disk()\u0027 para cubrir tambi\u00e9n los \u00edndices de compresi\u00f3n compactos de subp\u00e1gina.\n\nTambi\u00e9n corrige la posici\u00f3n de la comprobaci\u00f3n \u0027m -\u003e type \u003e= Z_EROFS_LCLUSTER_TYPE_MAX\u0027, ya que deber\u00eda colocarse justo despu\u00e9s de \u0027z_erofs_load_{compact,full}_lcluster()\u0027."
          }
        ],
        "id": "CVE-2025-68251",
        "lastModified": "2026-10-21T13:18:21.770",
        "metrics": {},
        "published": "2025-12-16T15:15:54.413",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8675447a8794983f2b7e694b378112772c17635e"
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:37:15+00:00",
      "cve": "CVE-2025-68251",
      "id": "CVE-2025-68251",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (erofs): Denial of Service via corrupted subpage compact indexes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68251.json",
      "version": "3"
    }
  }
}



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