CVE-2025-40179 (GCVE-0-2025-40179)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2026-05-11 21:44
VLAI
Title
ext4: verify orphan file size is not too big
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: verify orphan file size is not too big In principle orphan file can be arbitrarily large. However orphan replay needs to traverse it all and we also pin all its buffers in memory. Thus filesystems with absurdly large orphan files can lead to big amounts of memory consumed. Limit orphan file size to a sane value and also use kvmalloc() for allocating array of block descriptor structures to avoid large order allocations for sane but large orphan files.
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: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 95a21611b14ae0a401720645245a8db16f040995 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 566a1d6084563bd07433025aa23bcea4427de107 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 304fc34ff6fc8261138fd81f119e024ac3a129e9 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < a2d803fab8a6c6a874277cb80156dc114db91921 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 2b9da798ff0f4d026c5f0f815047393ebe7d8859 (git)
Affected: 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 , < 0a6ce20c156442a4ce2a404747bb0fb05d54eeb3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.157 , ≤ 6.1.* (semver)
Unaffected: 6.6.113 , ≤ 6.6.* (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: verify orphan file size is not too big\n\nIn principle orphan file can be arbitrarily large. However orphan replay\nneeds to traverse it all and we also pin all its buffers in memory. Thus\nfilesystems with absurdly large orphan files can lead to big amounts of\nmemory consumed. Limit orphan file size to a sane value and also use\nkvmalloc() for allocating array of block descriptor structures to avoid\nlarge order allocations for sane but large orphan files."
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:44:17.422Z",
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        "shortName": "Linux"
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    "cveId": "CVE-2025-40179",
    "datePublished": "2025-11-12T21:56:24.882Z",
    "dateReserved": "2025-04-16T07:20:57.177Z",
    "dateUpdated": "2026-05-11T21:44:17.422Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: verify orphan file size is not too big\n\nIn principle orphan file can be arbitrarily large. However orphan replay\nneeds to traverse it all and we also pin all its buffers in memory. Thus\nfilesystems with absurdly large orphan files can lead to big amounts of\nmemory consumed. Limit orphan file size to a sane value and also use\nkvmalloc() for allocating array of block descriptor structures to avoid\nlarge order allocations for sane but large orphan files."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\next4: verificar que el tama\u00f1o del archivo hu\u00e9rfano no sea demasiado grande\n\nEn principio, un archivo hu\u00e9rfano puede ser arbitrariamente grande. Sin embargo, la reproducci\u00f3n de hu\u00e9rfanos necesita recorrerlo todo y tambi\u00e9n fijamos todos sus b\u00faferes en memoria. As\u00ed, los sistemas de archivos con archivos hu\u00e9rfanos absurdamente grandes pueden llevar a grandes cantidades de memoria consumida. Limitar el tama\u00f1o del archivo hu\u00e9rfano a un valor razonable y tambi\u00e9n usar kvmalloc() para asignar un array de estructuras de descriptores de bloques para evitar asignaciones de orden grande para archivos hu\u00e9rfanos razonables pero grandes."
          }
        ],
        "id": "CVE-2025-40179",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-11-12T22:15:44.613",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: verify orphan file size is not too big",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40179.json",
      "version": "3"
    }
  }
}



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