cve-2024-42304
Vulnerability from cvelistv5
Published
2024-08-17 09:09
Modified
2024-12-19 09:16
Severity ?
Summary
ext4: make sure the first directory block is not a hole
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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              "content": {
                "id": "CVE-2024-42304",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:10:22.365835Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "product": "Linux",
          "programFiles": [
            "fs/ext4/namei.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "5.3"
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              "versionType": "semver"
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              "version": "5.4.282",
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              "lessThanOrEqual": "6.1.*",
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              "status": "unaffected",
              "version": "6.10.3",
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              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: make sure the first directory block is not a hole\n\nThe syzbot constructs a directory that has no dirblock but is non-inline,\ni.e. the first directory block is a hole. And no errors are reported when\ncreating files in this directory in the following flow.\n\n    ext4_mknod\n     ...\n      ext4_add_entry\n        // Read block 0\n        ext4_read_dirblock(dir, block, DIRENT)\n          bh = ext4_bread(NULL, inode, block, 0)\n          if (!bh \u0026\u0026 (type == INDEX || type == DIRENT_HTREE))\n          // The first directory block is a hole\n          // But type == DIRENT, so no error is reported.\n\nAfter that, we get a directory block without \u0027.\u0027 and \u0027..\u0027 but with a valid\ndentry. This may cause some code that relies on dot or dotdot (such as\nmake_indexed_dir()) to crash.\n\nTherefore when ext4_read_dirblock() finds that the first directory block\nis a hole report that the filesystem is corrupted and return an error to\navoid loading corrupted data from disk causing something bad."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:16:01.855Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6"
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      ],
      "title": "ext4: make sure the first directory block is not a hole",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42304",
    "datePublished": "2024-08-17T09:09:10.545Z",
    "dateReserved": "2024-07-30T07:40:12.272Z",
    "dateUpdated": "2024-12-19T09:16:01.855Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42304\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:10.617\",\"lastModified\":\"2024-08-19T12:59:59.177\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: make sure the first directory block is not a hole\\n\\nThe syzbot constructs a directory that has no dirblock but is non-inline,\\ni.e. the first directory block is a hole. And no errors are reported when\\ncreating files in this directory in the following flow.\\n\\n    ext4_mknod\\n     ...\\n      ext4_add_entry\\n        // Read block 0\\n        ext4_read_dirblock(dir, block, DIRENT)\\n          bh = ext4_bread(NULL, inode, block, 0)\\n          if (!bh \u0026\u0026 (type == INDEX || type == DIRENT_HTREE))\\n          // The first directory block is a hole\\n          // But type == DIRENT, so no error is reported.\\n\\nAfter that, we get a directory block without \u0027.\u0027 and \u0027..\u0027 but with a valid\\ndentry. This may cause some code that relies on dot or dotdot (such as\\nmake_indexed_dir()) to crash.\\n\\nTherefore when ext4_read_dirblock() finds that the first directory block\\nis a hole report that the filesystem is corrupted and return an error to\\navoid loading corrupted data from disk causing something bad.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: aseg\u00farese de que el primer bloque de directorio no sea un agujero. El syzbot construye un directorio que no tiene bloque de directorios pero que no est\u00e1 en l\u00ednea, es decir, el primer bloque de directorio es un agujero. Y no se informan errores al crear archivos en este directorio en el siguiente flujo. ext4_mknod ... ext4_add_entry // Leer bloque 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh \u0026amp;\u0026amp; (type == INDEX || type == DIRENT_HTREE)) // El primer bloque de directorio es un agujero // Pero escriba == DIRENT, por lo que no se informa ning\u00fan error. Despu\u00e9s de eso, obtenemos un bloque de directorio sin \u0027.\u0027 y \u0027..\u0027 pero con un dentry v\u00e1lido. Esto puede provocar que alg\u00fan c\u00f3digo que depende de punto o punto punto (como make_indexed_dir()) falle. Por lo tanto, cuando ext4_read_dirblock() encuentra que el primer bloque de directorio es un agujero, informa que el sistema de archivos est\u00e1 da\u00f1ado y devuelve un error para evitar cargar datos corruptos desde el disco y causar algo malo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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