{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97438", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T14:53:16.869Z", "datePublished": "2026-09-24T16:03:51.466Z", "dateUpdated": "2026-10-03T10:58:23.213Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:58:23.213Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate index entry key bounds\n\n[BUG]\nA malformed NTFS directory index entry can advertise a key_size larger\nthan the bytes actually present in its NTFS_DE payload. Directory lookup\nthen passes that malformed key to cmp_fnames(), which can read past the\nend of the kmalloc'ed index buffer.\n\nBUG: KASAN: slab-out-of-bounds in fname_full_size fs/ntfs3/ntfs.h:590 [inline]\nBUG: KASAN: slab-out-of-bounds in cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46\nRead of size 1 at addr ffff88801c313018 by task syz.6.3365/9279\n\nCall Trace:\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xbe/0x130 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xd1/0x650 mm/kasan/report.c:482\n kasan_report+0xfb/0x140 mm/kasan/report.c:595\n __asan_report_load1_noabort+0x14/0x30 mm/kasan/report_generic.c:378\n fname_full_size fs/ntfs3/ntfs.h:590 [inline]\n cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46\n hdr_find_e.isra.0+0x3ed/0x670 fs/ntfs3/index.c:762\n indx_find+0x4b5/0x900 fs/ntfs3/index.c:1186\n dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254\n ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85\n __lookup_slow+0x241/0x450 fs/namei.c:1816\n lookup_slow fs/namei.c:1833 [inline]\n walk_component+0x31c/0x570 fs/namei.c:2151\n link_path_walk+0x592/0xd60 fs/namei.c:2519\n path_lookupat+0x138/0x660 fs/namei.c:2675\n filename_lookup+0x1f3/0x560 fs/namei.c:2705\n filename_setxattr+0xad/0x1c0 fs/xattr.c:660\n path_setxattrat+0x1d8/0x280 fs/xattr.c:713\n __do_sys_lsetxattr fs/xattr.c:754 [inline]\n __se_sys_lsetxattr fs/xattr.c:750 [inline]\n __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750\n ...\n\nAllocated by task 9279:\n kasan_save_stack+0x39/0x70 mm/kasan/common.c:56\n kasan_save_track+0x14/0x40 mm/kasan/common.c:77\n kasan_save_alloc_info+0x37/0x60 mm/kasan/generic.c:573\n poison_kmalloc_redzone mm/kasan/common.c:400 [inline]\n __kasan_kmalloc+0xc3/0xd0 mm/kasan/common.c:417\n kasan_kmalloc include/linux/kasan.h:262 [inline]\n __do_kmalloc_node mm/slub.c:5650 [inline]\n __kmalloc_noprof+0x2bd/0x900 mm/slub.c:5662\n kmalloc_noprof include/linux/slab.h:961 [inline]\n indx_read+0x41d/0xad0 fs/ntfs3/index.c:1059\n indx_find+0x447/0x900 fs/ntfs3/index.c:1179\n dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254\n ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85\n __lookup_slow+0x241/0x450 fs/namei.c:1816\n lookup_slow fs/namei.c:1833 [inline]\n walk_component+0x31c/0x570 fs/namei.c:2151\n link_path_walk+0x592/0xd60 fs/namei.c:2519\n path_lookupat+0x138/0x660 fs/namei.c:2675\n filename_lookup+0x1f3/0x560 fs/namei.c:2705\n filename_setxattr+0xad/0x1c0 fs/xattr.c:660\n path_setxattrat+0x1d8/0x280 fs/xattr.c:713\n __do_sys_lsetxattr fs/xattr.c:754 [inline]\n __se_sys_lsetxattr fs/xattr.c:750 [inline]\n __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750\n ...\n\n[CAUSE]\nThe index-header validators only validated INDEX_HDR-level geometry.\nThey did not walk each NTFS_DE to verify entry alignment, subnode\nlayout, or that key_size fit inside the entry payload. They also\nallowed a last sentinel entry to carry a non-zero key_size.\n\n[FIX]\nWalk every NTFS_DE in ntfs3's index-header validators and reject\nentries with invalid layout, mismatched subnode state, oversized\nkey_size, or non-zero sentinel keys before lookup or log replay can\nconsume them." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The oversized field is on-disk NTFS_DE.key_size in a directory INDEX_BUFFER. indx_read() kmallocs that buffer and the pre-fix index_hdr_check() accepted it; lsetxattr/open then reaches ntfs_lookup→dir_search_u→indx_find→hdr_find_e→cmp_fnames(), and ntfs_fill_super→ntfs_extend_init→dir_search_u hits the same walk. No SMB/NFS/TCP message carries key_size.\nAC:L - A crafted NTFS_DE with key_size larger than e->size minus sizeof(NTFS_DE), or a last sentinel with non-zero key_size, makes hdr_find_e() pass that length to cmp_fnames() on every lookup of that directory. Pre-fix index_hdr_check() only tested INDEX_HDR de_off/used/total. No race.\nPR:N - Crafting the image needs no host account. ntfs_fs_type.fs_flags is only FS_REQUIRES_DEV|FS_ALLOW_IDMAP (no FS_USERNS_MOUNT), so mount_capable() requires init-namespace CAP_SYS_ADMIN; that privileged mount of the attacker image is scored as UI:R, not attacker privilege.\nUI:R - index_hdr_check() and hdr_find_e() run only after path_mount→get_tree_bdev→ntfs_fill_super attaches the attacker-supplied block device. Because ntfs3 is not FS_USERNS_MOUNT, a victim, automounter, or admin must mount that image; ntfs_extend_init() even calls dir_search_u() during fill_super.\nS:U - The slab over-read in fname_full_size()/cmp_fnames() and any oops stay in the host kernel that mounted the volume. This is not a KVM/Xen guest-to-host escape or an IOMMU/DMA bypass.\nC:H - hdr_find_e() calls cmp_fnames(key, 0, e+1, key_size). fname_full_size() then ntfs_cmp_names_cpu() walk ATTR_FILE_NAME.name_len (u8, up to 255 UTF-16 units, 510 bytes) past a truncated NTFS_DE at the tail of indx_read()'s kmalloc(1<size or dlen, not the inflated key_size, so this is not an out-of-bounds write or control-flow hijack.\nA:H - KASAN reported a slab-out-of-bounds load of size 1 in fname_full_size() from indx_read()'s kmalloc INDEX_BUFFER (typically 4K). An entry at the buffer tail with oversized key_size reads into the next page and can oops the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c", "fs/ntfs3/index.c" ], "versions": [ { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "c8d93bc4823baecab3c39b877e16ac5f8d4d41ba", "status": "affected", "versionType": "git" }, { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "7feeb424bda7f6ffaf5090cdd01b300eaa74c02b", "status": "affected", "versionType": "git" }, { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "d564a885219a655077eefafeb72395a4580ebd69", "status": "affected", "versionType": "git" }, { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "a8f4fb6a7d58974ffc9aed597401528b181d76dc", "status": "affected", "versionType": "git" }, { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "0257e3ea00e19129f3ad5c039d8b8fdff0796835", "status": "affected", "versionType": "git" }, { "version": "82cae269cfa953032fbb8980a7d554d60fb00b17", "lessThan": "98d6e5d9dc1d34dcffc61549617581a5fe1ef807", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c", "fs/ntfs3/index.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c8d93bc4823baecab3c39b877e16ac5f8d4d41ba" }, { "url": "https://git.kernel.org/stable/c/7feeb424bda7f6ffaf5090cdd01b300eaa74c02b" }, { "url": "https://git.kernel.org/stable/c/d564a885219a655077eefafeb72395a4580ebd69" }, { "url": "https://git.kernel.org/stable/c/a8f4fb6a7d58974ffc9aed597401528b181d76dc" }, { "url": "https://git.kernel.org/stable/c/0257e3ea00e19129f3ad5c039d8b8fdff0796835" }, { "url": "https://git.kernel.org/stable/c/98d6e5d9dc1d34dcffc61549617581a5fe1ef807" } ], "title": "fs/ntfs3: validate index entry key bounds", "x_generator": { "engine": "bippy-1.2.0" } } } }