{"id":"CVE-2026-89617","summary":"fs/ntfs3: validate dirty page table on log replay","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate dirty page table on log replay\n\nEach DIR_PAGE_ENTRY ends in a page_lcns[] array whose length is the on-disk\nlcns_follow field. check_rstbl() validates the table bookkeeping but never\nchecks that this array fits in the entry, so a crafted lcns_follow lets the\nv0-\u003ev1 conversion memmove and later replay passes run off the entry.\n\nAdd check_dp_table() to reject, right after check_rstbl(), any entry larger\nthan its size claims via struct_size() (the same expression used to allocate\nthese entries, so the check is overflow-safe by construction). All consumers\ncan then trust lcns_follow as the real capacity. This covers every\npage_lcns[] access whose index is bounded by the entry itself (the\nconversion memmove, the HotFix store via find_dp(), and the self-bounded\nscan loops). Accesses whose index comes from the log record need a separate\nbound and are handled in a follow-up patch.","modified":"2026-09-13T03:47:19.564703695Z","published":"2026-09-11T19:45:16.737Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89617.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/006cb7713dec10368e699abc4367e5faa334c9a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0908da07c23be4f94b99dfd9a94765525f0fe4bd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1200c2779c43b62656ccbb67df9468a7a9af2484"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89617.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89617"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b46acd6a6a627d876898e1c84d3f84902264b445"},{"fixed":"1200c2779c43b62656ccbb67df9468a7a9af2484"},{"fixed":"2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56"},{"fixed":"0908da07c23be4f94b99dfd9a94765525f0fe4bd"},{"fixed":"006cb7713dec10368e699abc4367e5faa334c9a5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89617.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89617.json"}}],"schema_version":"1.9.0"}