{"id":"CVE-2026-89595","title":"kernel: fsnotify: Fix stale object mask after concurrent mark updates (CVE-2026-89595)","summary":"A flaw was found in the Linux kernel's fsnotify subsystem, affecting fanotify and inotify. A race condition can occur during concurrent updates to event marks, where the object mask becomes stale. This can lead to a denial of service or in…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-367","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T12:14:03+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89595.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89595.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89595"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532332"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89595"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89595"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89595.mbox"},{"url":"https://git.kernel.org/stable/c/947400af98b9e63841929d079a2c3ea0a8ba227b"},{"url":"https://git.kernel.org/stable/c/ac8d8b599d466a129122bded77db3d0f8b96b461"},{"url":"https://git.kernel.org/stable/c/e422777fdd4746de1109575c51e65038d4c5c1be"},{"url":"https://git.kernel.org/stable/c/27d172b60eeca5c8fd51b246f9fb959067cf102b"},{"url":"https://git.kernel.org/stable/c/2f09f08d602647fc4e328fc27ecb4c3008d10338"},{"url":"https://git.kernel.org/stable/c/de75382d6e354b2b055df4896d12a91969f12090"},{"url":"https://git.kernel.org/stable/c/343ae18e960f6c5f1d34d58a69750c62cd463228"},{"url":"https://git.kernel.org/stable/c/92289e66639f62abc754c6f3bce5ead7e98e4ee2"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.0021,"epssPercentile":0.11545,"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89595","body":"## Overview\n\nA flaw was found in the Linux kernel's fsnotify subsystem, affecting fanotify and inotify. A race condition can occur during concurrent updates to event marks, where the object mask becomes stale. This can lead to a denial of service or information disclosure, as events such as file modifications (e.g., FAN_MODIFY, IN_MODIFY) may not be properly reported to applications monitoring file system activity.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89595.json)\n\n**kernel: fsnotify: Fix stale object mask after concurrent mark updates** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.\n\nAffected:\n\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205454,"id":"CVE-2026-89595","ts":1789576719080,"field":"cvss","old":"2.5","new":"5.5"},{"seq":205453,"id":"CVE-2026-89595","ts":1789576719080,"field":"severity","old":"low","new":"medium"},{"seq":203980,"id":"CVE-2026-89595","ts":1789490230902,"field":"cvss","old":null,"new":"2.5"},{"seq":203979,"id":"CVE-2026-89595","ts":1789490230902,"field":"severity","old":"none","new":"low"},{"seq":147359,"id":"CVE-2026-89595","ts":1789270210596,"field":"cvss","old":null,"new":"2.5"},{"seq":147358,"id":"CVE-2026-89595","ts":1789270210596,"field":"severity","old":"none","new":"low"},{"seq":109114,"id":"CVE-2026-89595","ts":1789183730357,"field":"cvss","old":null,"new":"2.5"},{"seq":109113,"id":"CVE-2026-89595","ts":1789183730357,"field":"severity","old":"none","new":"low"}]}