CVE-2024-47660
Description
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| sles | affected | | |
| debian | bookworm | fixed | 6.1.112-1 |
| debian | bullseye | fixed | 6.1.119-1~deb11u1 |
| debian | forky | fixed | 6.10.9-1 |
| debian | sid | fixed | 6.10.9-1 |
| debian | trixie | fixed | 6.10.9-1 |
| linux-kernel | affected | 5.10.226 |
References
- https://access.redhat.com/errata/RHSA-2025:6966
- https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e
- https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d
- https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a
- https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e
- https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8
- https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://www.suse.com/security/cve/CVE-2024-47660.html
- https://security-tracker.debian.org/tracker/CVE-2024-47660
CWEs
CWE-362
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.