{"id":"CVE-2026-89611","title":"kernel: ntfs: validate non-resident attribute offsets (CVE-2026-89611)","summary":"A flaw was found in the Linux kernel. The NTFS file system driver does not properly validate non-resident attribute offsets when converting between sparse and non-sparse attributes. A local attacker could craft a malicious Master File Tabl…","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":"2026-09-18T22:15:33+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89611.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89611.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89611"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532167"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89611"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89611"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89611.mbox"},{"url":"https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c"},{"url":"https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00379,"epssPercentile":0.31827,"scores":{"vendor":5.7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89611","body":"## Overview\n\nA flaw was found in the Linux kernel. The NTFS file system driver does not properly validate non-resident attribute offsets when converting between sparse and non-sparse attributes. A local attacker could craft a malicious Master File Table (MFT) record, which could lead to writing data beyond allocated memory boundaries or overlapping with other critical data. This memory corruption could result in a denial of service (DoS) 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-2026-89611.json)\n\n**kernel: ntfs: validate non-resident attribute offsets** — 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":208077,"id":"CVE-2026-89611","ts":1789922705539,"field":"cvss","old":"5.7","new":"5.5"},{"seq":202859,"id":"CVE-2026-89611","ts":1789403732699,"field":"cvss","old":"9.8","new":"5.7"},{"seq":202858,"id":"CVE-2026-89611","ts":1789403732699,"field":"severity","old":"critical","new":"medium"},{"seq":197853,"id":"CVE-2026-89611","ts":1789384320681,"field":"cvss","old":"5.7","new":"9.8"},{"seq":197852,"id":"CVE-2026-89611","ts":1789384320681,"field":"severity","old":"medium","new":"critical"},{"seq":183410,"id":"CVE-2026-89611","ts":1789356675252,"field":"cvss","old":"9.8","new":"5.7"},{"seq":183409,"id":"CVE-2026-89611","ts":1789356675252,"field":"severity","old":"critical","new":"medium"},{"seq":153440,"id":"CVE-2026-89611","ts":1789285350521,"field":"cvss","old":null,"new":"9.8"},{"seq":153439,"id":"CVE-2026-89611","ts":1789285350521,"field":"severity","old":"none","new":"critical"},{"seq":147642,"id":"CVE-2026-89611","ts":1789270211708,"field":"cvss","old":null,"new":"5.7"},{"seq":147641,"id":"CVE-2026-89611","ts":1789270211708,"field":"severity","old":"none","new":"medium"},{"seq":109396,"id":"CVE-2026-89611","ts":1789183731753,"field":"cvss","old":null,"new":"5.7"},{"seq":109395,"id":"CVE-2026-89611","ts":1789183731753,"field":"severity","old":"none","new":"medium"}]}