CVE-2024-42304 (GCVE-0-2024-42304)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2026-08-05 11:36
VLAI
Title
ext4: make sure the first directory block is not a hole
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: make sure the first directory block is not a hole The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow. ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh && (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported. After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash. Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3a17ca864baffc0c6f6e8aad525aa4365775a193 , < d81d7e347d1f1f48a5634607d39eb90c161c8afe (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < e02f9941e8c011aa3eafa799def6a134ce06bcfa (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < de2a011a13a46468a6e8259db58b1b62071fe136 (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < 9771e3d8365ae1dd5e8846a204cb9af14e3e656a (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < b609753cbbd38f8c0affd4956c0af178348523ac (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < c3893d9de8ee153baac56d127d844103488133b5 (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < 299bc6ffa57e04e74c6cce866d6c0741fb4897a1 (git)
Affected: 4e19d6b65fb4fc42e352ce9883649e049da14743 , < f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6 (git)
Affected: 3f0307b0d2d8b333a6964fc4c820dc86896fd1cf (git)
Affected: 514631c2225c1fd556c799cc1893fb27b0f48f00 (git)
Affected: 7f1f86276515f6816a98f6ca3ef99c827d54642f (git)
Affected: 5021b7a5bdd6bb859eb648c3da71cdd6aae1d133 (git)
Affected: 4.19.62 , < 4.19.320 (semver)
Affected: 4.9.187 , < 4.10 (semver)
Affected: 4.14.135 , < 4.15 (semver)
Affected: 5.1.21 , < 5.2 (semver)
Affected: 5.2.4 , < 5.3 (semver)
Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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              "value": "AV:L - Exploitation requires a locally mounted ext4 filesystem containing the crafted directory and is driven by ordinary local syscalls (creat/mknod/rename) against that directory. There is no network-facing path into `ext4_add_entry()` without a locally mounted corrupt image.\nAC:L - The attacker fully controls the on-disk image, so the block-0 hole and the resulting dot/dotdot-less directory are created deterministically; no race, timing window, or uncontrollable memory layout is involved. A single file creation followed by a rename reliably reaches `make_indexed_dir()`/`do_split()`.\nPR:L - Once the crafted or corrupted filesystem is mounted, any unprivileged local user with write access to the affected directory triggers the bug through normal file-creation and rename syscalls. No CAP_SYS_ADMIN or other capability is checked on this path.\nUI:N - No victim action is needed at exploit time \u2014 the corrupt filesystem may already be mounted (shared/automounted removable media via udisks2, or pre-existing on-disk corruption), and the trigger is the attacker\u0027s own syscalls. This matches CNA precedent for ext4 bugs triggered by operations on an already-mounted corrupt image.\nS:U - The out-of-bounds access and directory-metadata corruption occur entirely within the kernel\u0027s own security authority on the affected host. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dot/dotdot-less directory causes `do_split()` to index `map[0xFFFFFFFF]`, an unbounded out-of-bounds read far outside the buffer whose result is folded into the persisted htree hash, and `ext4_htree_fill_tree()` copies attacker-chosen `name_len` bytes of adjacent block data out to userspace via getdents. This is arbitrary/unbounded kernel memory disclosure, not a few strictly bounded bytes.\nI:H - The kernel silently accepts and writes back corrupt directory metadata \u2014 allocating and populating block 0 without `.`/`..`, then running `dx_move_dirents()`/`dx_pack_dirents()` memcpy/memset operations and `dx_insert_block()` driven by a bogus entry map and out-of-bounds-derived hash. The resulting attacker-influenced kernel memory corruption and on-disk directory/htree corruption is exploitable for control-flow-relevant heap manipulation.\nA:H - The wild out-of-bounds read triggers an unrecoverable page fault / kernel oops (as captured by syzbot) while the task holds the directory `i_rwsem` and an open jbd2 transaction handle, hanging the filesystem for all other users. Any kernel oops or panic is High availability impact."
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      "id": "CVE-2024-42304",
      "lastModified": "2024-08-19T12:59:59.177",
      "published": "2024-08-17T09:15:10.617",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42304\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:10.617\",\"lastModified\":\"2026-08-04T11:19:50.437\",\"vulnStatus\":\"Modified\",\"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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:33:14+00:00",
      "cve": "CVE-2024-42304",
      "id": "CVE-2024-42304",
      "initial_release_date": "2024-08-17T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: make sure the first directory block is not a hole",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-42304.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T00:54:09Z",
      "cve": "CVE-2024-42304",
      "id": "CVE-2024-42304",
      "initial_release_date": "2024-08-18T02:02:21Z",
      "product_status:known_affected": "474",
      "product_status:known_not_affected": "125",
      "product_status:recommended": "680",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-42304",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-42304.json",
      "version": "62"
    },
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\"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.2.4\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/ext4/namei.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.320\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.282\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.224\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.44\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/namei.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe\"}, {\"url\": \"https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa\"}, {\"url\": \"https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136\"}, {\"url\": \"https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a\"}, {\"url\": \"https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac\"}, {\"url\": \"https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5\"}, {\"url\": \"https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1\"}, {\"url\": \"https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.320\", \"versionStartIncluding\": \"4.19.62\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.282\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.224\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.165\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.103\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.44\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.3\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.187\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.135\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.1.21\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.2.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:52:48.104Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42304\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:52:48.104Z\", \"dateReserved\": \"2024-07-30T07:40:12.272Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-17T09:09:10.545Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.