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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2ba466d74ed74f073257f86e61519cb8f8f46184 to < c33c2b0d92aa1c2262d999b2598ad6fbd53bd479affected2ba466d74ed74f073257f86e61519cb8f8f46184 to < 07c176e7acc5579c133bb923ab21316d192d0a95affected2ba466d74ed74f073257f86e61519cb8f8f46184 to < 2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7affected2ba466d74ed74f073257f86e61519cb8f8f46184 to < b11e8fb93ea5eefb2e4e719497ea177a58ff6131affected2ba466d74ed74f073257f86e61519cb8f8f46184 to < 1b7d549ed2c1fa202c751b69423a0d3a6bd5a180affected2ba466d74ed74f073257f86e61519cb8f8f46184 to < 3ab40870edb883b9633dc5cd55f5a2a11afa618daffected2ba466d74ed74f073257f86e61519cb8f8f46184 to < 265fff1a01cdc083aeaf0d934c929db5cc64aebfaffected2ba466d74ed74f073257f86e61519cb8f8f46184 to < bb76c6c274683c8570ad788f79d4b875bde0e458affected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected4.19.318 to ≤ 4.19.*unaffected5.4.280 to ≤ 5.4.*unaffected5.10.222 to ≤ 5.10.*unaffected5.15.163 to ≤ 5.15.*unaffected6.1.98 to ≤ 6.1.*unaffected6.6.39 to ≤ 6.6.*unaffected6.9.9 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c33c2b0d92aa1c2262d999b2598ad6fbd53bd479 ↗
- https://git.kernel.org/stable/c/07c176e7acc5579c133bb923ab21316d192d0a95 ↗
- https://git.kernel.org/stable/c/2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7 ↗
- https://git.kernel.org/stable/c/b11e8fb93ea5eefb2e4e719497ea177a58ff6131 ↗
- https://git.kernel.org/stable/c/1b7d549ed2c1fa202c751b69423a0d3a6bd5a180 ↗
- https://git.kernel.org/stable/c/3ab40870edb883b9633dc5cd55f5a2a11afa618d ↗
- https://git.kernel.org/stable/c/265fff1a01cdc083aeaf0d934c929db5cc64aebf ↗
- https://git.kernel.org/stable/c/bb76c6c274683c8570ad788f79d4b875bde0e458 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗