CVE-2025-38691 (GCVE-0-2025-38691)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-10-15 01:07
VLAI
Title
pNFS: Fix uninited ptr deref in block/scsi layout
Summary
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix uninited ptr deref in block/scsi layout The error occurs on the third attempt to encode extents. When function ext_tree_prepare_commit() reallocates a larger buffer to retry encoding extents, the "layoutupdate_pages" page array is initialized only after the retry loop. But ext_tree_free_commitdata() is called on every iteration and tries to put pages in the array, thus dereferencing uninitialized pointers. An additional problem is that there is no limit on the maximum possible buffer_size. When there are too many extents, the client may create a layoutcommit that is larger than the maximum possible RPC size accepted by the server. During testing, we observed two typical scenarios. First, one memory page for extents is enough when we work with small files, append data to the end of the file, or preallocate extents before writing. But when we fill a new large file without preallocating, the number of extents can be huge, and counting the number of written extents in ext_tree_encode_commit() does not help much. Since this number increases even more between unlocking and locking of ext_tree, the reallocated buffer may not be large enough again and again.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 579b85f893d9885162e1cabf99a4a088916e143e (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 2896f101110076ac6bf99d7aaf463d61e26f89dd (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 4f783333cbfa2ee7d4aa8e47f6bd1b3f77534fcf (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 9be5c04beca3202d0a5f09fb4b2ecb644caa0bc5 (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 24334f3cf8a294f253071b5bf22d754dbb6d0f2d (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < f0b2eee3fbba9b7e3746ef698424ef5e4a197776 (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 94ec6d939031a616474376dadbf4a8d0ef8b0bcc (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 37c3443a2685528f972d910a6fb87716b96fef46 (git)
Affected: 34dc93c2fc04da0d01acf8a1660b4ab276208af7 , < 9768797c219326699778fba9cd3b607b2f1e7950 (git)
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Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix uninited ptr deref in block/scsi layout\n\nThe error occurs on the third attempt to encode extents. When function\next_tree_prepare_commit() reallocates a larger buffer to retry encoding\nextents, the \"layoutupdate_pages\" page array is initialized only after the\nretry loop. But ext_tree_free_commitdata() is called on every iteration\nand tries to put pages in the array, thus dereferencing uninitialized\npointers.\n\nAn additional problem is that there is no limit on the maximum possible\nbuffer_size. When there are too many extents, the client may create a\nlayoutcommit that is larger than the maximum possible RPC size accepted\nby the server.\n\nDuring testing, we observed two typical scenarios. First, one memory page\nfor extents is enough when we work with small files, append data to the\nend of the file, or preallocate extents before writing. But when we fill\na new large file without preallocating, the number of extents can be huge,\nand counting the number of written extents in ext_tree_encode_commit()\ndoes not help much. Since this number increases even more between\nunlocking and locking of ext_tree, the reallocated buffer may not be\nlarge enough again and again."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npNFS: Correcci\u00f3n de desreferencia de puntero no inicializado en el dise\u00f1o de bloque/scsi\n\nEl error ocurre en el tercer intento de codificar extensiones. Cuando la funci\u00f3n ext_tree_prepare_commit() reasigna un b\u00fafer m\u00e1s grande para reintentar la codificaci\u00f3n de extensiones, el array de p\u00e1ginas \u0027layoutupdate_pages\u0027 se inicializa solo despu\u00e9s del bucle de reintento. Pero ext_tree_free_commitdata() es llamada en cada iteraci\u00f3n e intenta colocar p\u00e1ginas en el array, desreferenciando as\u00ed punteros no inicializados.\n\nUn problema adicional es que no hay l\u00edmite en el tama\u00f1o m\u00e1ximo posible de b\u00fafer. Cuando hay demasiadas extensiones, el cliente puede crear un layoutcommit que es m\u00e1s grande que el tama\u00f1o m\u00e1ximo posible de RPC aceptado por el servidor.\n\nDurante las pruebas, observamos dos escenarios t\u00edpicos. Primero, una p\u00e1gina de memoria para extensiones es suficiente cuando trabajamos con archivos peque\u00f1os, adjuntamos datos al final del archivo o preasignamos extensiones antes de escribir. Pero cuando llenamos un nuevo archivo grande sin preasignar, el n\u00famero de extensiones puede ser enorme, y contar el n\u00famero de extensiones escritas en ext_tree_encode_commit() no ayuda mucho. Dado que este n\u00famero aumenta a\u00fan m\u00e1s entre el desbloqueo y el bloqueo de ext_tree, el b\u00fafer reasignado puede no ser lo suficientemente grande una y otra vez."
          }
        ],
        "id": "CVE-2025-38691",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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      "current_release_date": "2026-06-30T01:14:55+00:00",
      "cve": "CVE-2025-38691",
      "id": "CVE-2025-38691",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: pNFS: Fix uninited ptr deref in block/scsi layout",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38691.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-15T16:36:01Z",
      "cve": "CVE-2025-38691",
      "id": "CVE-2025-38691",
      "initial_release_date": "2025-09-05T23:24:11Z",
      "product_status:known_affected": "726",
      "product_status:known_not_affected": "32",
      "product_status:recommended": "532",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38691",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-38691.json",
      "version": "61"
    }
  }
}



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