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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Redhat
  • Enterprise Linux

No data.

Package CPE Advisory Released Date
Red Hat Enterprise Linux 9
kernel-0:5.14.0-570.12.1.el9_6 cpe:/a:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
kernel-0:5.14.0-570.12.1.el9_6 cpe:/o:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
References
Link Providers
https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1 cve-icon cve-icon
https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a cve-icon cve-icon
https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac cve-icon cve-icon
https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5 cve-icon cve-icon
https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe cve-icon cve-icon
https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136 cve-icon cve-icon
https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa cve-icon cve-icon
https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024081749-CVE-2024-42304-d0e4@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-42304 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-42304 cve-icon
History

Wed, 14 May 2025 02:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux

Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 19 Aug 2024 19:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Mon, 19 Aug 2024 04:45:00 +0000

Type Values Removed Values Added
References

Sat, 17 Aug 2024 09:15:00 +0000

Type Values Removed Values Added
Description 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.
Title ext4: make sure the first directory block is not a hole
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T12:58:00.209Z

Reserved: 2024-07-30T07:40:12.272Z

Link: CVE-2024-42304

cve-icon Vulnrichment

Updated: 2024-09-11T12:42:23.530Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-08-17T09:15:10.617

Modified: 2024-08-19T12:59:59.177

Link: CVE-2024-42304

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-08-17T00:00:00Z

Links: CVE-2024-42304 - Bugzilla