ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in d1f98938e437732c0ecdfc8ee451e12a072f6d07; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 0505f1e7bb5b981b6ed62d98b26ddce76142865d; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in ed6da1abeec50db9060d714f03743fe0b63e4fe4; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 6a8149a20e46086c756c2a9202e377c0b649a0c3; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in aa1bdbb39f49c5bc9779316891c40005517842a5
- Linux Linux
5.15
- KernelLinux
From 5.15.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53