{"id":"CVE-2026-89782","revision":"b739a45c37e945ed883cea2b1ebd4af0","records":[{"revision":"b739a45c37e945ed883cea2b1ebd4af0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89782","aliases":[],"title":"fs/ntfs3: reject restart table growth beyond U16_MAX entries","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: reject restart table growth beyond U16_MAX entries\n\nDuring $LogFile replay, log_replay() indexes the transaction table by the\ntransact_id taken from the log record header. check_log_rec() only\nverifies that transact_id is non-zero and properly aligned, not its\nmagnitude, so a crafted image can request an arbitrarily large index.\n\nalloc_rsttbl_from_idx() grows the table to cover that index via\nextend_rsttbl(), which passes the new entry count to init_rsttbl():\n\n\trt = init_rsttbl(esize, used + add);\n\nused + add is computed as u32 but init_rsttbl() takes a u16, and the\ncount is stored in struct RESTART_TABLE as a __le16. When used + add\nexceeds U16_MAX it is truncated, init_rsttbl() allocates a table far\nsmaller than the index requires, and alloc_rsttbl_from_idx() then\ndereferences and writes at the original, untruncated offset -- an\nout-of-bounds access past the allocation, reachable by mounting a\ncrafted NTFS image.\n\n BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n Read of size 4 at addr ffff8880327ffff8 by task exploit\n alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n log_replay (fs/ntfs3/fslog.c:4562)\n ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324)\n ntfs_fill_super (fs/ntfs3/super.c:1393)\n get_tree_bdev_flags\n vfs_get_tree\n path_mount\n __x64_sys_mount\n\nA restart table is limited to U16_MAX entries by its __le16 count, so a\nlarger growth request is invalid input. Reject it in extend_rsttbl();\nall callers already handle a NULL return.","state":0,"publishedAt":"2026-09-16T08:48:21.093+00:00","modifiedAt":"2026-10-19T08:52:34.456+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\": \"caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"339e59996ff193adcf1c438cf05f19e753beb3a7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"ecde45cd81dc28f5696c312c5ce5a509962e9ab1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"be218a01aadffe33ed4fc73e25276d676ebbd09d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"aad605a450611e2a7b7cf9dd5724004d39192bfb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"967a5ff8a614d10126b6d46db1ac040948d6cb42\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b46acd6a6a627d876898e1c84d3f84902264b445\",\n \"lessThan\": \"111f8d74a19d85942ecbb3aba78f6f3c88e59391\",\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/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56","https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7","https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1","https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d","https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb","https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42","https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89782","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89782","identifiers":["CVE-2026-89782"]},"retained":false,"historicalAffected":[]}],"coverage":[]}