{"id":"CVE-2026-89495","title":"kernel: ocfs2: bound namelen in dlm_migrate_request_handler (CVE-2026-89495)","summary":"A flaw was found in ocfs2 in the Linux kernel. A malicious or compromised node within a Distributed Lock Manager (DLM) cluster can send specially crafted messages with unchecked length fields. This can lead to a heap out-of-bounds write, p…","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-120","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T21:28:38+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89495.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89495.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89495"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532097"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89495"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89495"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89495.mbox"},{"url":"https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd"},{"url":"https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d"},{"url":"https://git.kernel.org/stable/c/006c96ea488eca2ef5155ec76038e0a4dbf65f0a"},{"url":"https://git.kernel.org/stable/c/24989909d3413b44b104102caa6661b1e424ba0f"},{"url":"https://git.kernel.org/stable/c/f8658ee3327f73bd81c0bcd07cdeb5a8527fac98"},{"url":"https://git.kernel.org/stable/c/de10cd3b062a5235af754925fcf49beb5a1109d4"},{"url":"https://git.kernel.org/stable/c/2487bea2098322669f0563baff53e797486b823f"},{"url":"https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00704,"epssPercentile":0.51477,"scores":{"vendor":5.5,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89495","body":"## Overview\n\nA flaw was found in ocfs2 in the Linux kernel. A malicious or compromised node within a Distributed Lock Manager (DLM) cluster can send specially crafted messages with unchecked length fields. This can lead to a heap out-of-bounds write, potentially allowing for arbitrary code execution, or an out-of-bounds read, which can cause a kernel panic and result in a Denial of Service (DoS).\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-2026-89495.json)\n\n**kernel: ocfs2: bound namelen in dlm_migrate_request_handler** — 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":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":206948,"id":"CVE-2026-89495","ts":1789749713406,"field":"cvss","old":"9.8","new":"5.5"},{"seq":206947,"id":"CVE-2026-89495","ts":1789749713406,"field":"severity","old":"critical","new":"medium"},{"seq":198006,"id":"CVE-2026-89495","ts":1789384321344,"field":"cvss","old":"6.4","new":"9.8"},{"seq":198005,"id":"CVE-2026-89495","ts":1789384321344,"field":"severity","old":"medium","new":"critical"},{"seq":183783,"id":"CVE-2026-89495","ts":1789356677369,"field":"cvss","old":"9.8","new":"6.4"},{"seq":183782,"id":"CVE-2026-89495","ts":1789356677369,"field":"severity","old":"critical","new":"medium"},{"seq":153284,"id":"CVE-2026-89495","ts":1789285349881,"field":"cvss","old":null,"new":"9.8"},{"seq":153283,"id":"CVE-2026-89495","ts":1789285349881,"field":"severity","old":"none","new":"critical"},{"seq":147782,"id":"CVE-2026-89495","ts":1789270212268,"field":"cvss","old":null,"new":"6.4"},{"seq":147781,"id":"CVE-2026-89495","ts":1789270212268,"field":"severity","old":"none","new":"medium"},{"seq":109530,"id":"CVE-2026-89495","ts":1789183732301,"field":"cvss","old":null,"new":"6.4"},{"seq":109529,"id":"CVE-2026-89495","ts":1789183732301,"field":"severity","old":"none","new":"medium"}]}