CVE-2024-42104

HIGH
Published Jul 30, 2024 Modified Nov 3, 2025 CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: add missing check for inode numbers on directory entries Syzbot reported that mounting and unmounting a specific pattern of corrupted nilfs2 filesystem images causes a use-after-free of metadata file inodes, which triggers a kernel bug in lru_add_fn(). As Jan Kara pointed out, this is because the link count of a metadata file gets corrupted to 0, and nilfs_evict_inode(), which is called from iput(), tries to delete that inode (ifile inode in this case). The inconsistency occurs because directories containing the inode numbers of these metadata files that should not be visible in the namespace are read without checking. Fix this issue by treating the inode numbers of these internal files as errors in the sanity check helper when reading directory folios/pages. Also thanks to Hillf Danton and Matthew Wilcox for their initial mm-layer analysis.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/07c176e7acc5579c133bb923ab21316d192d0a95 https://git.kernel.org/stable/c/1b7d549ed2c1fa202c751b69423a0d3a6bd5a180 https://git.kernel.org/stable/c/265fff1a01cdc083aeaf0d934c929db5cc64aebf https://git.kernel.org/stable/c/2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7 https://git.kernel.org/stable/c/3ab40870edb883b9633dc5cd55f5a2a11afa618d https://git.kernel.org/stable/c/b11e8fb93ea5eefb2e4e719497ea177a58ff6131 https://git.kernel.org/stable/c/bb76c6c274683c8570ad788f79d4b875bde0e458 https://git.kernel.org/stable/c/c33c2b0d92aa1c2262d999b2598ad6fbd53bd479 https://git.kernel.org/stable/c/07c176e7acc5579c133bb923ab21316d192d0a95 https://git.kernel.org/stable/c/1b7d549ed2c1fa202c751b69423a0d3a6bd5a180 https://git.kernel.org/stable/c/265fff1a01cdc083aeaf0d934c929db5cc64aebf https://git.kernel.org/stable/c/2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7 https://git.kernel.org/stable/c/3ab40870edb883b9633dc5cd55f5a2a11afa618d https://git.kernel.org/stable/c/b11e8fb93ea5eefb2e4e719497ea177a58ff6131 https://git.kernel.org/stable/c/bb76c6c274683c8570ad788f79d4b875bde0e458 https://git.kernel.org/stable/c/c33c2b0d92aa1c2262d999b2598ad6fbd53bd479

Frequently Asked Questions

What is CVE-2024-42104? +
In the Linux kernel, the following vulnerability has been resolved: nilfs2: add missing check for inode numbers on directory entries Syzbot reported that mounting and unmounting a specific pattern of corrupted nilfs2 filesystem images causes a use-after-free of metadata file inodes, which triggers a kernel bug in lru_add_fn(). As Jan Kara pointed out, this is because the link count of a metadata file gets corrupted to 0, and nilfs_evict_inode(), which is called from iput(), tries to delete that inode (ifile inode in this case). The inconsistency occurs because directories containing the inode numbers of these metadata files that should not be visible in the namespace are read without checking. Fix this issue by treating the inode numbers of these internal files as errors in the sanity check helper when reading directory folios/pages. Also thanks to Hillf Danton and Matthew Wilcox for their initial mm-layer analysis. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2024-42104? +
CVE-2024-42104 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2024-42104? +
CVE-2024-42104 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-42104? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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