{"id":"CVE-2026-89614","title":"ntfs: bound the free-cluster bitmap scan to the volume","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound the free-cluster bitmap scan to the volume\n\nvol->lcn_empty_bits_per_page is sized from vol->nr_clusters at mount, but\nntfs_cluster_alloc() bounds its scan o…","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-125"],"vendor":"Linux","product":"Linux","affected":["Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < dc15a9f5307d5372aef3b64bf3ed7802f530c471","Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < 19cac7902a8ab748e15f98ddaafcf5f8882be21d","Linux 7.1"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:49:46.853Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89614","references":[{"url":"https://git.kernel.org/stable/c/dc15a9f5307d5372aef3b64bf3ed7802f530c471"},{"url":"https://git.kernel.org/stable/c/19cac7902a8ab748e15f98ddaafcf5f8882be21d"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89614.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89614"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532318"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89614"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89614"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89614.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00553,"epssPercentile":0.46016,"scores":{"cna":9.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89614","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound the free-cluster bitmap scan to the volume\n\nvol->lcn_empty_bits_per_page is sized from vol->nr_clusters at mount, but\nntfs_cluster_alloc() bounds its scan of that array by the size of $Bitmap.\nThose are independent on-disk quantities and the mount-time check only\nrejects a $Bitmap that is too small, so an image whose $Bitmap covers more\nclusters than the volume has lets the scan index past the array.  A run\nwhose LCN lies in that gap takes the allocator straight there, since the\ncaller passes the file's own last LCN as its locality hint.  KASAN reports\na slab out-of-bounds read when a file on such a volume is extended.\n\nClamp the scan to what that array covers, mirroring the max_index\ncalculation the mount-time scan already uses, and reject a decoded LCN\nat or beyond nr_clusters in the mapping pairs decoder.  Conforming\nvolumes are unaffected.\n\n## Affected\n\n- `Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < dc15a9f5307d5372aef3b64bf3ed7802f530c471`\n- `Linux >= 11ccc9107dc460de28af90fac1f42404d9802735 < 19cac7902a8ab748e15f98ddaafcf5f8882be21d`\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 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89614.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224665,"id":"CVE-2026-89614","ts":1792401466468,"field":"cvss","old":"5.5","new":"9.8"},{"seq":224664,"id":"CVE-2026-89614","ts":1792401466468,"field":"severity","old":"medium","new":"critical"},{"seq":205467,"id":"CVE-2026-89614","ts":1789576721328,"field":"cvss","old":"4.7","new":"5.5"},{"seq":202855,"id":"CVE-2026-89614","ts":1789403732684,"field":"cvss","old":"9.8","new":"4.7"},{"seq":202854,"id":"CVE-2026-89614","ts":1789403732684,"field":"severity","old":"critical","new":"medium"},{"seq":197851,"id":"CVE-2026-89614","ts":1789384320673,"field":"cvss","old":"4.7","new":"9.8"},{"seq":197850,"id":"CVE-2026-89614","ts":1789384320673,"field":"severity","old":"medium","new":"critical"},{"seq":183414,"id":"CVE-2026-89614","ts":1789356675269,"field":"cvss","old":"9.8","new":"4.7"},{"seq":183413,"id":"CVE-2026-89614","ts":1789356675269,"field":"severity","old":"critical","new":"medium"},{"seq":153446,"id":"CVE-2026-89614","ts":1789285350545,"field":"cvss","old":null,"new":"9.8"},{"seq":153445,"id":"CVE-2026-89614","ts":1789285350545,"field":"severity","old":"none","new":"critical"},{"seq":147381,"id":"CVE-2026-89614","ts":1789270210680,"field":"cvss","old":null,"new":"4.7"},{"seq":147380,"id":"CVE-2026-89614","ts":1789270210680,"field":"severity","old":"none","new":"medium"},{"seq":109143,"id":"CVE-2026-89614","ts":1789183730478,"field":"cvss","old":null,"new":"4.7"},{"seq":109142,"id":"CVE-2026-89614","ts":1789183730478,"field":"severity","old":"none","new":"medium"}]}