CVE-2024-42104

nilfs2: add missing check for inode numbers on directory entries

State: Published
Severity: 7.8 High
Published: Jul 30, 2024
Updated: Aug 5, 2026
Reserved: Jul 29, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	2ba466d74ed74f073257f86e61519cb8f8f46184 to before c33c2b0d92aa1c2262d999b2598ad6fbd53bd479Affected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before 07c176e7acc5579c133bb923ab21316d192d0a95Affected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before 2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7Affected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before b11e8fb93ea5eefb2e4e719497ea177a58ff6131Affected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before 1b7d549ed2c1fa202c751b69423a0d3a6bd5a180Affected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before 3ab40870edb883b9633dc5cd55f5a2a11afa618dAffected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before 265fff1a01cdc083aeaf0d934c929db5cc64aebfAffected 2ba466d74ed74f073257f86e61519cb8f8f46184 to before bb76c6c274683c8570ad788f79d4b875bde0e458Affected
LinuxLinux	2.6.30Affected before 2.6.30Not affected 4.19.318 through 4.19.Not affected 5.4.280 through 5.4.Not affected 5.10.222 through 5.10.Not affected 5.15.163 through 5.15.Not affected 6.1.98 through 6.1.Not affected 6.6.39 through 6.6.Not affected 6.9.9 through 6.9.*Not affected 6.10 and laterNot affected

Product

Versions

LinuxLinux

2ba466d74ed74f073257f86e61519cb8f8f46184 to before c33c2b0d92aa1c2262d999b2598ad6fbd53bd479Affected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before 07c176e7acc5579c133bb923ab21316d192d0a95Affected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before 2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7Affected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before b11e8fb93ea5eefb2e4e719497ea177a58ff6131Affected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before 1b7d549ed2c1fa202c751b69423a0d3a6bd5a180Affected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before 3ab40870edb883b9633dc5cd55f5a2a11afa618dAffected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before 265fff1a01cdc083aeaf0d934c929db5cc64aebfAffected
2ba466d74ed74f073257f86e61519cb8f8f46184 to before bb76c6c274683c8570ad788f79d4b875bde0e458Affected

LinuxLinux

2.6.30Affected
before 2.6.30Not affected
4.19.318 through 4.19.*Not affected
5.4.280 through 5.4.*Not affected
5.10.222 through 5.10.*Not affected
5.15.163 through 5.15.*Not affected
6.1.98 through 6.1.*Not affected
6.6.39 through 6.6.*Not affected
6.9.9 through 6.9.*Not affected
6.10 and laterNot affected

References

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