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

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2025-11-03 22:04
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 ?
No CVSS data available.
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)
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.
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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\": \"2025-05-04T12:58:00.209Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42304\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:58:00.209Z\", \"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": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.