{"id":"CVE-2026-97437","summary":"ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()","details":"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-\u003ename_len (a\ncharacter count) against e-\u003esize (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-\u003ename_len + sizeof(struct NTFS_DE) \u003e le16_to_cpu(e-\u003esize))\n\nThis computes: name_len + 16 \u003e 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) \u003e e_size\n\nWhich computes: 16 + 66 + name_len * 2 \u003e 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-\u003esize\nbut large fname-\u003ename_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.","modified":"2026-10-22T10:31:58.858464322Z","published":"2026-09-24T16:03:50.105Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97437.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0505f1e7bb5b981b6ed62d98b26ddce76142865d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a8149a20e46086c756c2a9202e377c0b649a0c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa1bdbb39f49c5bc9779316891c40005517842a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d1f98938e437732c0ecdfc8ee451e12a072f6d07"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed6da1abeec50db9060d714f03743fe0b63e4fe4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97437.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97437"},{"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":"4342306f0f0d5ff4315a204d315c1b51b914fca5"},{"fixed":"d1f98938e437732c0ecdfc8ee451e12a072f6d07"},{"fixed":"0505f1e7bb5b981b6ed62d98b26ddce76142865d"},{"fixed":"2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba"},{"fixed":"ed6da1abeec50db9060d714f03743fe0b63e4fe4"},{"fixed":"6a8149a20e46086c756c2a9202e377c0b649a0c3"},{"fixed":"aa1bdbb39f49c5bc9779316891c40005517842a5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97437.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97437.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"}]}