CVE-2024-42304
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- CVE-2024-42304
CVE Details
| Release Date: | 2024-08-17 | |
| Impact: | Moderate | What is this? |
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.
See more information about CVE-2024-42304 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 metrics
| Base Score: | 5.5 |
| Vector String: | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Version: | 3.1 |
| Attack Vector: | Local |
| Attack Complexity: | Low |
| Privileges Required: | Low |
| User Interaction: | None |
| Scope: | Unchanged |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (kernel-uek) | ELSA-2024-12780 | 2024-10-11 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2024-12782 | 2024-10-14 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2024-12868 | 2024-12-06 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2024-12780 | 2024-10-11 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2024-12782 | 2024-10-14 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2024-12815 | 2024-11-11 |
| Oracle Linux version 9 (kernel) | ELSA-2025-6966 | 2025-05-16 |
| Oracle Linux version 9 (kernel-uek) | ELSA-2024-12815 | 2024-11-11 |
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