{"id":"CVE-2026-89612","title":"ntfs: reject invalid MFT LCNs from boot sector","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject invalid MFT LCNs from boot sector\n\nThe NTFS boot sector stores the MFT and MFTMirr locations as unsigned\n64-bit LCNs, but parse_ntfs_boot_sector() decoded …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"Linux","product":"Linux","affected":["Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < 8f8420b68a6f05ca2b03779d8208814ec539b9e5","Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2","Linux 7.1"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:49:44.526Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89612","references":[{"url":"https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5"},{"url":"https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2"},{"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"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00553,"epssPercentile":0.46015,"scores":{"cna":9.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89612","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject invalid MFT LCNs from boot sector\n\nThe NTFS boot sector stores the MFT and MFTMirr locations as unsigned\n64-bit LCNs, but parse_ntfs_boot_sector() decoded them into an s64.\n\nA crafted high-bit value could therefore become negative and pass\nthe existing upper-bound check. The invalid value then propagated into\nthe MFT zone allocator and could result in an out-of-bounds access to\nlcn_empty_bits_per_page.\n\n## Affected\n\n- `Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < 8f8420b68a6f05ca2b03779d8208814ec539b9e5`\n- `Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2`\n- `Linux 7.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224673,"id":"CVE-2026-89612","ts":1792401468218,"field":"cvss","old":"5.5","new":"9.8"},{"seq":224672,"id":"CVE-2026-89612","ts":1792401468218,"field":"severity","old":"medium","new":"critical"},{"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"}]}