{"api_version":"1","generated_at":"2026-09-25T08:35:37+00:00","cve":"CVE-2026-97437","urls":{"html":"https://cve.report/CVE-2026-97437","api":"https://cve.report/api/cve/CVE-2026-97437.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97437","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97437"},"summary":{"title":"ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()\n\nThe bounds check in ntfs_dir_emit() compares fname->name_len (a\ncharacter count) against e->size (a byte count) without accounting\nfor the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME\nheader size:\n\n  if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size))\n\nThis computes: name_len + 16 > e_size\n\nThe correct check must account for the ATTR_FILE_NAME header (66 bytes\nbefore the name) and the UTF-16LE character size (2 bytes each):\n\n  sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) +\n  name_len * sizeof(short) > e_size\n\nWhich computes: 16 + 66 + name_len * 2 > e_size\n\nThe correct calculation already exists as fname_full_size() in ntfs.h\nand is used in cmp_fnames(), namei.c, and fslog.c, but was not used\nin the readdir path.\n\nA crafted NTFS image with an index entry containing a small e->size\nbut large fname->name_len bypasses the current check, causing\nntfs_utf16_to_nls() to read past the entry boundary.\n\nAdditionally, add a key_size validation in hdr_find_e() to ensure the\ndeclared key_size does not exceed the available entry data, preventing\ncomparison functions from reading past entry boundaries on the lookup\npath.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 17:17:21","updated_at":"2026-09-25 05:17:05"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","data":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/6a8149a20e46086c756c2a9202e377c0b649a0c3","name":"https://git.kernel.org/stable/c/6a8149a20e46086c756c2a9202e377c0b649a0c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aa1bdbb39f49c5bc9779316891c40005517842a5","name":"https://git.kernel.org/stable/c/aa1bdbb39f49c5bc9779316891c40005517842a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ed6da1abeec50db9060d714f03743fe0b63e4fe4","name":"https://git.kernel.org/stable/c/ed6da1abeec50db9060d714f03743fe0b63e4fe4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97437","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97437","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ed6da1abeec50db9060d714f03743fe0b63e4fe4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6a8149a20e46086c756c2a9202e377c0b649a0c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 aa1bdbb39f49c5bc9779316891c40005517842a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.111 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.53 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ntfs3/dir.c","fs/ntfs3/index.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ed6da1abeec50db9060d714f03743fe0b63e4fe4","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"6a8149a20e46086c756c2a9202e377c0b649a0c3","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"aa1bdbb39f49c5bc9779316891c40005517842a5","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"6.12.111","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.18.53","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs3/dir.c","fs/ntfs3/index.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()\n\nThe bounds check in ntfs_dir_emit() compares fname->name_len (a\ncharacter count) against e->size (a byte count) without accounting\nfor the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME\nheader size:\n\n  if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size))\n\nThis computes: name_len + 16 > e_size\n\nThe correct check must account for the ATTR_FILE_NAME header (66 bytes\nbefore the name) and the UTF-16LE character size (2 bytes each):\n\n  sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) +\n  name_len * sizeof(short) > e_size\n\nWhich computes: 16 + 66 + name_len * 2 > e_size\n\nThe correct calculation already exists as fname_full_size() in ntfs.h\nand is used in cmp_fnames(), namei.c, and fslog.c, but was not used\nin the readdir path.\n\nA crafted NTFS image with an index entry containing a small e->size\nbut large fname->name_len bypasses the current check, causing\nntfs_utf16_to_nls() to read past the entry boundary.\n\nAdditionally, add a key_size validation in hdr_find_e() to ensure the\ndeclared key_size does not exceed the available entry data, preventing\ncomparison functions from reading past entry boundaries on the lookup\npath."}],"metrics":[{"cvssV3_1":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The attacker-controlled bytes are on-disk NTFS_DE.size, ATTR_FILE_NAME.name_len and NTFS_DE.key_size. getdents64→iterate_dir→ntfs_readdir→ntfs_read_hdr→ntfs_dir_emit() and ntfs_lookup/ntfs_fill_super→ntfs_extend_init→dir_search_u→indx_find→hdr_find_e() consume those fields; no SMB, NFS, or TCP message carries them.\nAC:L - A crafted index entry with e->size >= name_len+sizeof(NTFS_DE) but smaller than sizeof(NTFS_DE)+offsetof(ATTR_FILE_NAME,name)+name_len*2 bypasses the old ntfs_dir_emit() check so ntfs_utf16_to_nls() over-reads on every readdir of that directory; the same image can set key_size > e->size-sizeof(NTFS_DE) so hdr_find_e() passes an oversized key to cmp_fnames(). No race.\nPR:N - Crafting the NTFS 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 mount is scored as UI:R, not attacker privilege. ntfs_dir_emit() and hdr_find_e() have no capable() gate after the volume is mounted.\nUI:R - The bad name_len and key_size are inert on-disk until a victim or automount helper mounts the image via path_mount→get_tree_bdev→ntfs_fill_super. That mount is the required user action; ntfs_extend_init() even calls dir_search_u()→hdr_find_e() during fill_super, and a subsequent getdents reaches ntfs_dir_emit().\nS:U - The over-read in ntfs_utf16_to_nls()/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 boundary bypass.\nC:H - ntfs_dir_emit() hands attacker-chosen fname->name_len (u8, up to 255 UTF-16 units) to ntfs_utf16_to_nls() after a check that ignores the 66-byte ATTR_FILE_NAME header and 2-byte encoding, so up to ~321 bytes past the NTFS_DE—and past indx_read()'s kmalloc(1<<index_bits) if the entry is at the buffer tail—are converted and dir_emit()'d into getdents. hdr_find_e() likewise lets cmp_fnames() read past that slab.\nI:N - ntfs_utf16_to_nls() writes only into the PATH_MAX buffer kmalloc'd by ntfs_readdir(); dir_emit()/filldir() then copy that name to the user dirent. hdr_find_e's cmp_fnames() returns only a comparison integer. Neither path is an out-of-bounds write, UAF, or control-flow hijack.\nA:H - indx_read() kmallocs 1<<index_bits (typically 4K) for the INDEX_BUFFER. An entry near the end with name_len=255, or key_size larger than the remaining payload, makes ntfs_utf16_to_nls() or fname_full_size() in cmp_fnames() read off that object, which can fault unmapped adjacent pages and oops the kernel."}]}],"providerMetadata":{"dateUpdated":"2026-09-25T05:10:35.086Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ed6da1abeec50db9060d714f03743fe0b63e4fe4"},{"url":"https://git.kernel.org/stable/c/6a8149a20e46086c756c2a9202e377c0b649a0c3"},{"url":"https://git.kernel.org/stable/c/aa1bdbb39f49c5bc9779316891c40005517842a5"}],"title":"ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97437","datePublished":"2026-09-24T16:03:50.105Z","dateReserved":"2026-09-24T14:53:16.869Z","dateUpdated":"2026-09-25T05:10:35.086Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 17:17:21","lastModifiedDate":"2026-09-25 05:17:05","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97437","Ordinal":"1","Title":"ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e(","CVE":"CVE-2026-97437","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97437","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()\n\nThe bounds check in ntfs_dir_emit() compares fname->name_len (a\ncharacter count) against e->size (a byte count) without accounting\nfor the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME\nheader size:\n\n  if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size))\n\nThis computes: name_len + 16 > e_size\n\nThe correct check must account for the ATTR_FILE_NAME header (66 bytes\nbefore the name) and the UTF-16LE character size (2 bytes each):\n\n  sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) +\n  name_len * sizeof(short) > e_size\n\nWhich computes: 16 + 66 + name_len * 2 > e_size\n\nThe correct calculation already exists as fname_full_size() in ntfs.h\nand is used in cmp_fnames(), namei.c, and fslog.c, but was not used\nin the readdir path.\n\nA crafted NTFS image with an index entry containing a small e->size\nbut large fname->name_len bypasses the current check, causing\nntfs_utf16_to_nls() to read past the entry boundary.\n\nAdditionally, add a key_size validation in hdr_find_e() to ensure the\ndeclared key_size does not exceed the available entry data, preventing\ncomparison functions from reading past entry boundaries on the lookup\npath.","Type":"Description","Title":"ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e("}]}}}