CVE-2026-46040Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails When fsnotify_add_inode_mark_locked() fails in inotify_new_watch(), the error path calls inot…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.1%
Last analysed / modified upstream
0.1% → 0.2%
In the Linux kernel, the following vulnerability has been resolved:
inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails
When fsnotify_add_inode_mark_locked() fails in inotify_new_watch(), the error path calls inotify_remove_from_idr() but does not call dec_inotify_watches() to undo the preceding inc_inotify_watches(). This leaks a watch count, and repeated failures can exhaust the max_user_watches limit with -ENOSPC even when no watches are active.
Prior to commit 1cce1eea0aff ("inotify: Convert to using per-namespace limits"), the watch count was incremented after fsnotify_add_mark_locked() succeeded, so this path was not affected. The conversion moved inc_inotify_watches() before the mark insertion without adding the corresponding rollback.
Add the missing dec_inotify_watches() call in the error path.
linux_kernel >= 4.11, < 5.10.258linux_kernel >= 5.11, < 5.15.209linux_kernel >= 5.16, < 6.1.175linux_kernel >= 6.2, < 6.6.140linux_kernel >= 6.7, < 6.12.86linux_kernel >= 6.13, < 6.18.27linux_kernel >= 6.19, < 7.0.4Upgrade past the affected range:
linux_kernel 7.0.4Connected by shared product, vendor, weakness, or advisory.
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