Time-of-check Time-of-use (TOCTOU) Affecting openshift/ose-rhel-coreos-8 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL7-OPENSHIFTOSERHELCOREOS8-20008441
- published20 Sept 2026
- disclosed11 Sept 2026
Introduced: 11 Sep 2026
NewCVE-2026-89595 (opens in a new tab)How to fix?
There is no fixed version for RHEL:7 openshift/ose-rhel-coreos-8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openshift/ose-rhel-coreos-8 package and not the openshift/ose-rhel-coreos-8 package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2026-89595
- https://git.kernel.org/stable/c/947400af98b9e63841929d079a2c3ea0a8ba227b
- https://git.kernel.org/stable/c/ac8d8b599d466a129122bded77db3d0f8b96b461
- https://git.kernel.org/stable/c/e422777fdd4746de1109575c51e65038d4c5c1be
- https://git.kernel.org/stable/c/27d172b60eeca5c8fd51b246f9fb959067cf102b
- https://git.kernel.org/stable/c/2f09f08d602647fc4e328fc27ecb4c3008d10338
- https://git.kernel.org/stable/c/343ae18e960f6c5f1d34d58a69750c62cd463228
- https://git.kernel.org/stable/c/92289e66639f62abc754c6f3bce5ead7e98e4ee2
- https://git.kernel.org/stable/c/de75382d6e354b2b055df4896d12a91969f12090