{"id":"CVE-2026-98136","summary":"ntfs: bound $AttrDef table walk to the loaded table size","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound $AttrDef table walk to the loaded table size\n\nntfs_attr_find_in_attrdef() walks the in-memory $AttrDef table, but the\nloop condition bounds only the start of each entry, not the whole entry:\n\n\tfor (ad = vol-\u003eattrdef; (u8 *)ad - (u8 *)vol-\u003eattrdef \u003c\n\t\t\tvol-\u003eattrdef_size && ad-\u003etype; ++ad)\n\nstruct attr_def is 160 bytes; the guard reads ad-\u003etype at offset 128 and\nthe loop body reads further fields. vol-\u003eattrdef is kvzalloc(i_size),\nwhere i_size is the on-disk $AttrDef data size, checked in\nload_and_init_attrdef() only as 0 \u003c i_size \u003c= 0x7fffffff. A volume whose\n$AttrDef data size is smaller than one entry (e.g. 120 bytes) makes the\nread of ad-\u003etype run past the allocation. Creating a file reaches this\nthrough ntfs_attr_size_bounds_check() and reads out of bounds:\n\n  BUG: KASAN: slab-out-of-bounds in ntfs_attr_find_in_attrdef+0x66/0xa0\n  Read of size 4 at addr ffff888005833280 by task init/1\n   ntfs_attr_find_in_attrdef\n   ntfs_attr_size_bounds_check\n   ntfs_attr_can_be_non_resident\n   ntfs_attr_add\n\nRequire the whole entry to lie within attrdef_size in the loop guard, and\nreject at mount a $AttrDef too small to hold one attr_def entry.","modified":"2026-09-27T03:47:31.977741877Z","published":"2026-09-25T10:36:14.106Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98136.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3e2ae47b8ebc632c27e7843a4632d9a7c060885e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8504fc1245f5322af5fa5c325ab05f9cf792b87"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98136.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98136"},{"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":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669"},{"fixed":"3e2ae47b8ebc632c27e7843a4632d9a7c060885e"},{"fixed":"c8504fc1245f5322af5fa5c325ab05f9cf792b87"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98136.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98136.json"}}],"schema_version":"1.9.0"}