{"id":"CVE-2026-89612","title":"kernel: ntfs: reject invalid MFT LCNs from boot sector (CVE-2026-89612)","summary":"A flaw was found in the Linux kernel's NTFS filesystem driver. A local attacker could provide a specially crafted NTFS boot sector containing an invalid Master File Table (MFT) Logical Cluster Number (LCN). Due to an integer overflow durin…","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-787","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T22:15:38+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89612.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89612.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89612"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532112"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89612"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89612"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89612.mbox"},{"url":"https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5"},{"url":"https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00553,"epssPercentile":0.45057,"scores":{"vendor":4.7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89612","body":"## Overview\n\nA flaw was found in the Linux kernel's NTFS filesystem driver. A local attacker could provide a specially crafted NTFS boot sector containing an invalid Master File Table (MFT) Logical Cluster Number (LCN). Due to an integer overflow during parsing, this could lead to an out-of-bounds memory access. This vulnerability may result in system instability or a denial of service.\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-2026-89612.json)\n\n**kernel: ntfs: reject invalid MFT LCNs from boot sector** — 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":208076,"id":"CVE-2026-89612","ts":1789922705353,"field":"cvss","old":"4.7","new":"5.5"},{"seq":202857,"id":"CVE-2026-89612","ts":1789403732691,"field":"cvss","old":"9.8","new":"4.7"},{"seq":202856,"id":"CVE-2026-89612","ts":1789403732691,"field":"severity","old":"critical","new":"medium"},{"seq":197857,"id":"CVE-2026-89612","ts":1789384320696,"field":"cvss","old":"4.7","new":"9.8"},{"seq":197856,"id":"CVE-2026-89612","ts":1789384320696,"field":"severity","old":"medium","new":"critical"},{"seq":183412,"id":"CVE-2026-89612","ts":1789356675260,"field":"cvss","old":"9.8","new":"4.7"},{"seq":183411,"id":"CVE-2026-89612","ts":1789356675260,"field":"severity","old":"critical","new":"medium"},{"seq":153442,"id":"CVE-2026-89612","ts":1789285350529,"field":"cvss","old":null,"new":"9.8"},{"seq":153441,"id":"CVE-2026-89612","ts":1789285350529,"field":"severity","old":"none","new":"critical"},{"seq":147702,"id":"CVE-2026-89612","ts":1789270211943,"field":"cvss","old":null,"new":"4.7"},{"seq":147701,"id":"CVE-2026-89612","ts":1789270211943,"field":"severity","old":"none","new":"medium"},{"seq":109456,"id":"CVE-2026-89612","ts":1789183731984,"field":"cvss","old":null,"new":"4.7"},{"seq":109455,"id":"CVE-2026-89612","ts":1789183731984,"field":"severity","old":"none","new":"medium"}]}