CVE-2026-97437

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/d1f98938e437732c0ecdfc8ee451e12a072f6d07 ↗
• https://git.kernel.org/stable/c/0505f1e7bb5b981b6ed62d98b26ddce76142865d ↗
• https://git.kernel.org/stable/c/2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba ↗
• https://git.kernel.org/stable/c/ed6da1abeec50db9060d714f03743fe0b63e4fe4 ↗
• https://git.kernel.org/stable/c/6a8149a20e46086c756c2a9202e377c0b649a0c3 ↗
• https://git.kernel.org/stable/c/aa1bdbb39f49c5bc9779316891c40005517842a5 ↗