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ext4: make sure the first directory block is not a hole

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
4.19.320, 5.10.224, 5.15.165, 5.4.282, 6.1.103, 6.10.3, 6.6.44
CVEs
CVE-2024-42304
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 08:15 UTC · Revision 1

Source evidence

ext4: make sure the first directory block is not a hole

core-osv · Original source

Published 17 Aug 2024, 09:09 UTC

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.

osv:CVE-2024-42304

Kernel

Fixed versions: 4.19.320, 5.4.282, 5.10.224, 5.15.165, 6.1.103, 6.6.44, 6.10.3

Complete source record
{
  "id": "72ecf329470eee7541a108604a0ede42e946911528a0ad070535d3de5a25b872",
  "url": "https://osv.dev/vulnerability/CVE-2024-42304",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2024-42304",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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      "aliases": [
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      "modified": "2026-10-28T02:30:27.081100408Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1",
        "https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a",
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        "https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5",
        "https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe",
        "https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136",
        "https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa",
        "https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6",
        "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42304.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-42304",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493683,
  "published_at": "2024-08-17T09:09:10.545+00:00"
}