CVE-2025-38692 (GCVE-0-2025-38692)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-05-11 21:33
VLAI
Title
exfat: add cluster chain loop check for dir
Summary
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
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 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 868f23286c1a13162330fa6c614fe350f78e3f82 (git)
Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33 (git)
Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < e2066ca3ef49a30920d8536fa366b2a183a808ee (git)
Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 4c3cda20c4cf1871e27868d08fda06b79bc7d568 (git)
Affected: 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 , < 99f9a97dce39ad413c39b92c90393bbd6778f3fd (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (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.
Show details on NVD website
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            "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."
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nexfat: a\u00f1adir comprobaci\u00f3n de bucle en cadena de cl\u00fasteres para directorio\n\nPuede ocurrir un bucle infinito si se dan las siguientes condiciones debido a la corrupci\u00f3n del sistema de archivos.\n\n(1) Condici\u00f3n para que exfat_count_dir_entries() entre en bucle infinito.\n    - La cadena de cl\u00fasteres incluye un bucle.\n    - No hay entrada UNUSED en la cadena de cl\u00fasteres.\n\n(2) Condici\u00f3n para que exfat_create_upcase_table() entre en bucle infinito.\n    - La cadena de cl\u00fasteres del directorio ra\u00edz incluye un bucle.\n    - No hay entrada UNUSED ni entrada de tabla de may\u00fasculas en la cadena de cl\u00fasteres del directorio ra\u00edz.\n\n(3) Condici\u00f3n para que exfat_load_bitmap() entre en bucle infinito.\n    - La cadena de cl\u00fasteres del directorio ra\u00edz incluye un bucle.\n    - No hay entrada UNUSED ni entrada de mapa de bits en la cadena de cl\u00fasteres del directorio ra\u00edz.\n\n(4) Condici\u00f3n para que exfat_find_dir_entry() entre en bucle infinito.\n    - La cadena de cl\u00fasteres incluye un bucle.\n    - Las entradas de directorio no utilizadas se agotaron por alguna operaci\u00f3n.\n\n(5) Condici\u00f3n para que exfat_check_dir_empty() entre en bucle infinito.\n    - La cadena de cl\u00fasteres incluye un bucle.\n    - Las entradas de directorio no utilizadas se agotaron por alguna operaci\u00f3n.\n    - Todos los archivos y subdirectorios bajo el directorio son eliminados.\n\nEste commit a\u00f1ade comprobaciones para romper el bucle infinito anterior."
          }
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        "id": "CVE-2025-38692",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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                "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",
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                "value": "CWE-835"
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      "current_release_date": "2026-06-30T01:14:57+00:00",
      "cve": "CVE-2025-38692",
      "id": "CVE-2025-38692",
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      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: exfat: add cluster chain loop check for dir",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38692.json",
      "version": "3"
    }
  }
}



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