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CVE-2026-97437

ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e() PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e() The bounds check in ntfs_dir_emit() compares fname->name_len (a character count) against e->size (a byte count) without accounting for the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME header size: if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size)) This computes: name_len + 16 > e_size The correct check must account for the ATTR_FILE_NAME header (66 bytes before the name) and the UTF-16LE character size (2 bytes each): sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) + name_len * sizeof(short) > e_size Which computes: 16 + 66 + name_len * 2 > e_size The correct calculation already exists as fname_full_size() in ntfs.h and is used in cmp_fnames(), namei.c, and fslog.c, but was not used in the readdir path. A crafted NTFS image with an index entry containing a small e->size but large fname->name_len bypasses the current check, causing ntfs_utf16_to_nls() to read past the entry boundary. Additionally, add a key_size validation in hdr_find_e() to ensure the declared key_size does not exceed the available entry data, preventing comparison functions from reading past entry boundaries on the lookup path.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before d1f98938e437732c0ecdfc8ee451e12a072f6d07; affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before 0505f1e7bb5b981b6ed62d98b26ddce76142865d; affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before 2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba; affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before ed6da1abeec50db9060d714f03743fe0b63e4fe4; affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before 6a8149a20e46086c756c2a9202e377c0b649a0c3; affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 before aa1bdbb39f49c5bc9779316891c40005517842a5
Linux / Linuxaffected 5.15; unaffected 0 before 5.15; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References