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CVE-2025-38692

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: exfat: add cluster chain loop check for dir An infinite loop may occur if the following conditions occur due to file system corruption. (1) Condition for exfat_count_dir_entries() to loop infinitely. - The cluster chain includes a loop. - There is no UNUSED entry in the cluster chain. (2) Condition for exfat_create_upcase_table() to loop infinitely. - The cluster chain of the root directory includes a loop. - There are no UNUSED entry and up-case table entry in the cluster chain of the root directory. (3) Condition for exfat_load_bitmap() to loop infinitely. - The cluster chain of the root directory includes a loop. - There are no UNUSED entry and bitmap entry in the cluster chain of the root directory. (4) Condition for exfat_find_dir_entry() to loop infinitely. - The cluster chain includes a loop. - The unused directory entries were exhausted by some operation. (5) Condition for exfat_check_dir_empty() to loop infinitely. - The cluster chain includes a loop. - The unused directory entries were exhausted by some operation. - All files and sub-directories under the directory are deleted. This commit adds checks to break the above infinite loop.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:37.447000
Last modified
2026-10-30 13:18:07.360000
View original CVE JSON 
{
  "id": "CVE-2025-38692",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-04T16:15:37.447",
  "lastModified": "2026-10-30T13:18:07.360",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: add cluster chain loop check for dir\n\nAn infinite loop may occur if the following conditions occur due to\nfile system corruption.\n\n(1) Condition for exfat_count_dir_entries() to loop infinitely.\n    - The cluster chain includes a loop.\n    - There is no UNUSED entry in the cluster chain.\n\n(2) Condition for exfat_create_upcase_table() to loop infinitely.\n    - The cluster chain of the root directory includes a loop.\n    - There are no UNUSED entry and up-case table entry in the cluster\n      chain of the root directory.\n\n(3) Condition for exfat_load_bitmap() to loop infinitely.\n    - The cluster chain of the root directory includes a loop.\n    - There are no UNUSED entry and bitmap entry in the cluster chain\n      of the root directory.\n\n(4) Condition for exfat_find_dir_entry() to loop infinitely.\n    - The cluster chain includes a loop.\n    - The unused directory entries were exhausted by some operation.\n\n(5) Condition for exfat_check_dir_empty() to loop infinitely.\n    - The cluster chain includes a loop.\n    - The unused directory entries were exhausted by some operation.\n    - All files and sub-directories under the directory are deleted.\n\nThis commit adds checks to break the above infinite loop."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nexfat: añadir comprobación de bucle en cadena de clústeres para directorio\n\nPuede ocurrir un bucle infinito si se dan las siguientes condiciones debido a la corrupción del sistema de archivos.\n\n(1) Condición para que exfat_count_dir_entries() entre en bucle infinito.\n    - La cadena de clústeres incluye un bucle.\n    - No hay entrada UNUSED en la cadena de clústeres.\n\n(2) Condición para que exfat_create_upcase_table() entre en bucle infinito.\n    - La cadena de clústeres del directorio raíz incluye un bucle.\n    - No hay entrada UNUSED ni entrada de tabla de mayúsculas en la cadena de clústeres del directorio raíz.\n\n(3) Condición para que exfat_load_bitmap() entre en bucle infinito.\n    - La cadena de clústeres del directorio raíz incluye un bucle.\n    - No hay entrada UNUSED ni entrada de mapa de bits en la cadena de clústeres del directorio raíz.\n\n(4) Condición para que exfat_find_dir_entry() entre en bucle infinito.\n    - La cadena de clústeres incluye un bucle.\n    - Las entradas de directorio no utilizadas se agotaron por alguna operación.\n\n(5) Condición para que exfat_check_dir_empty() entre en bucle infinito.\n    - La cadena de clústeres incluye un bucle.\n    - Las entradas de directorio no utilizadas se agotaron por alguna operación.\n    - Todos los archivos y subdirectorios bajo el directorio son eliminados.\n\nEste commit añade comprobaciones para romper el bucle infinito anterior."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/exfat/dir.c",
            "fs/exfat/fatent.c",
            "fs/exfat/namei.c",
            "fs/exfat/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "lessThan": "1715f0996f7baf817c73613aeda500c4f73a6bd6",
              "versionType": "git",
              "status": "affected"
            },
            {
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              "lessThan": "868f23286c1a13162330fa6c614fe350f78e3f82",
              "versionType": "git",
              "status": "affected"
            },
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              "lessThan": "aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "lessThan": "e2066ca3ef49a30920d8536fa366b2a183a808ee",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003",
              "lessThan": "4c3cda20c4cf1871e27868d08fda06b79bc7d568",
              "versionType": "git",
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              "versionType": "git",
              "status": "affected"
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          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/exfat/dir.c",
            "fs/exfat/fatent.c",
            "fs/exfat/namei.c",
            "fs/exfat/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.7",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.103",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.43",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.15.11",
              "lessThanOrEqual": "6.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.16.2",
              "lessThanOrEqual": "6.16.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "6.6.103",
              "matchCriteriaId": "23914B23-DA2F-4BFF-A11B-9674F8A6BD86"
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              "versionStartIncluding": "6.13",
              "versionEndExcluding": "6.15.11",
              "matchCriteriaId": "BC242347-F722-43AE-B910-BE0B22386977"
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.16",
              "versionEndExcluding": "6.16.2",
              "matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899"
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  "references": [
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      "url": "https://git.kernel.org/stable/c/1715f0996f7baf817c73613aeda500c4f73a6bd6",
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}