{"id":"CVE-2026-89600","title":"kernel: fanotify: fix use-after-free of file range info (CVE-2026-89600)","summary":"A flaw was found in the Linux kernel's fanotify subsystem. This use-after-free vulnerability occurs when the system attempts to report file range information after the memory holding that information has been released. A local attacker cou…","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-825","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:32:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89600"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532299"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89600"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89600"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89600.mbox"},{"url":"https://git.kernel.org/stable/c/66aa9a9e6481bfa512ee5b6380eaaec455a954d2"},{"url":"https://git.kernel.org/stable/c/b8f73b163b646bc56d4dce9c697a578e333f4894"},{"url":"https://git.kernel.org/stable/c/d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00124,"epssPercentile":0.02433,"scores":{"vendor":5.3,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89600","body":"## Overview\n\nA flaw was found in the Linux kernel's fanotify subsystem. This use-after-free vulnerability occurs when the system attempts to report file range information after the memory holding that information has been released. A local attacker could potentially exploit this to read stale stack memory, leading to information disclosure or system instability.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json)\n\n**kernel: fanotify: fix use-after-free of file range info** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208139,"id":"CVE-2026-89600","ts":1789922723401,"field":"cvss","old":"5.3","new":"5.5"},{"seq":202865,"id":"CVE-2026-89600","ts":1789403732724,"field":"cvss","old":"7.8","new":"5.3"},{"seq":202864,"id":"CVE-2026-89600","ts":1789403732724,"field":"severity","old":"high","new":"medium"},{"seq":197874,"id":"CVE-2026-89600","ts":1789384320766,"field":"cvss","old":"5.3","new":"7.8"},{"seq":197873,"id":"CVE-2026-89600","ts":1789384320766,"field":"severity","old":"medium","new":"high"},{"seq":183427,"id":"CVE-2026-89600","ts":1789356675325,"field":"cvss","old":"7.8","new":"5.3"},{"seq":183426,"id":"CVE-2026-89600","ts":1789356675325,"field":"severity","old":"high","new":"medium"},{"seq":153420,"id":"CVE-2026-89600","ts":1789285350441,"field":"cvss","old":null,"new":"7.8"},{"seq":153419,"id":"CVE-2026-89600","ts":1789285350441,"field":"severity","old":"none","new":"high"},{"seq":147420,"id":"CVE-2026-89600","ts":1789270210839,"field":"cvss","old":null,"new":"5.3"},{"seq":147419,"id":"CVE-2026-89600","ts":1789270210839,"field":"severity","old":"none","new":"medium"},{"seq":109170,"id":"CVE-2026-89600","ts":1789183730585,"field":"cvss","old":null,"new":"5.3"},{"seq":109169,"id":"CVE-2026-89600","ts":1789183730585,"field":"severity","old":"none","new":"medium"}]}