CVE-2026-89595
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
A race condition in the Linux kernel fsnotify subsystem was fixed, affecting event mask updates for marks. Concurrent updates to different marks on the same object could leave the object mask stale, causing events such as FAN_MODIFY or IN_MODIFY to be missed despite correct configuration. The issue affected fanotify and inotify.
Risk Assessment
Organizations using fanotify or inotify for file change monitoring may miss certain modification events, potentially causing security, auditing, or file synchronization systems to overlook important changes.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-89595. If immediate patching is not possible, review whether fanotify/inotify-based applications rely solely on modification events and consider additional change detection mechanisms.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix stale object mask after concurrent mark updates When a mark gets a new event bit, fanotify and inotify may avoid recalculating the object mask if the cached aggregate already contains that bit. This is racy with a recalculation triggered by a concurrent update to another mark on the same connector. The concurrent scan can read the mark before the new bit is added, while the updater reads the old aggregate before that scan publishes its result. The updater then skips recalculation and the scan publishes a mask without the bit, leaving the object mask stale after both updates complete. This can be reproduced with two fanotify groups watching the same inode: one thread removes FAN_MODIFY from one existing mark while another thread adds FAN_MODIFY to the other mark. After both fanotify_mark() calls return, writes can fail to produce FAN_MODIFY for the group whose mark now contains the bit. This was reproduced on an unmodified v6.12.95 kernel. The equivalent inotify interleaving loses IN_MODIFY events. For normal fanotify additions, recalculate whenever the raw mark mask changes. The normal mask is not cleared asynchronously, so an unchanged addition cannot introduce missing interest. Always recalculate ignore-mask updates because FS_MODIFY handling may clear the ignore mask without taking mark->lock, making snapshot comparisons unreliable. Always recalculate after updating an existing inotify watch. Its replace path temporarily sets mark->mask to zero, so a concurrent scan can observe zero even when the old and final masks are equal. Assigning the replacement mask directly would avoid the transient zero, but existing-watch updates are infrequent, so unconditional recalculation is simpler.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS