{"id":"CVE-2026-89781","revision":"7aa6f91bf60f4ec2aa4d593b20672ad4","records":[{"revision":"7aa6f91bf60f4ec2aa4d593b20672ad4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89781","aliases":[],"title":"fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix out-of-bounds read in read_log_rec_buf()\n\nread_log_rec_buf() copies a log record into a caller buffer starting at\n\n\tu32 off = lsn_to_page_off(log, lsn) + log->record_header_len;\n\nlog->record_header_len (and log->data_off, used for the following pages)\ncomes verbatim from the on-disk restart area and is only checked for\n8-byte alignment in is_rst_area_valid(), so off can exceed\nlog->page_size. \"tail = log->page_size - off\" then underflows and\nmemcpy() reads past the page_size-sized buffer returned by\nread_log_page(), spilling adjacent slab memory into the replay buffer.\n\nThis is reachable by mounting a crafted NTFS image:\n\n BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580\n Read of size 64 at addr ffff88800a877ff8 by task exploit/127\n read_log_rec_buf fs/ntfs3/fslog.c:2299\n log_replay fs/ntfs3/fslog.c:4216\n ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324\n ntfs_fill_super fs/ntfs3/super.c:1392\n get_tree_bdev_flags fs/super.c:1694\n __x64_sys_mount fs/namespace.c:4360\n The buggy address is located 4088 bytes to the right of\n the 4096-byte region [ffff88800a876000, ffff88800a877000)\n\nReject an in-page offset outside the current page before the copy.\n\n[almaz.alexandrovich@paragon-software.com: replaced the >= sign with >]","state":0,"publishedAt":"2026-09-16T08:48:20.425+00:00","modifiedAt":"2026-10-19T08:52:33.476+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ntfs3/fslog.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"df099bfdb57773ba7f40f8a9dcc82e75af277922\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"1b2d31f1083beb80c55d1152249f652c1445a559\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"700973cc65db405bde0368ccf88699390150943e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"49f7cbc902b08b56eb7d2633163ecc57a0e7145a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"74a83aa05f73033af719771ab1f0c269928b4865\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"de603b9d377fab57a5e6432fa84a9f36b32c1636\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/ntfs3/fslog.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922","https://git.kernel.org/stable/c/1b2d31f1083beb80c55d1152249f652c1445a559","https://git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e","https://git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a","https://git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865","https://git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531","https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89781","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89781","identifiers":["CVE-2026-89781"]},"retained":false,"historicalAffected":[]}],"coverage":[]}