Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation} In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`, where e->view.data_off comes from an on-disk NTFS_DE inside an INDEX_ROOT or INDEX_BUFFER. Neither case validates view.data_off + dlen against e->size; the existing check_if_index_root / check_if_alloc_index helpers walk the entry chain and validate the entry's offset, but not its internal view fields. The neighbouring read sites (e.g., fs/ntfs3/index.c when iterating view entries) check view.data_off + view.data_size <= e->size. Apply the same bound at the two memmove sites. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe instrumentation: with view.data_off forced to 0xFFFC, the memmove writes 32 bytes past the end of the NTFS_DE. This is similar in shape to Pavitra Jha's 2026-05-02 patch "fs/ntfs3: prevent oob in case UpdateRecordDataRoot" (<20260502105008.21827-1-jhapavitra98@gmail.com>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b46acd6a6a627d876898e1c84d3f84902264b445 before b20e5a709d8bd190d6e4645606763c7423e694c1; affected b46acd6a6a627d876898e1c84d3f84902264b445 before d41b382068ca4e64e421f736cdd700095464b6ac; affected b46acd6a6a627d876898e1c84d3f84902264b445 before 429d653ca641d38a78609b8f62e81a0a5c780a2d; affected b46acd6a6a627d876898e1c84d3f84902264b445 before 315d3a9a48b49f889da3d858a9307e677cb9e1bd; affected b46acd6a6a627d876898e1c84d3f84902264b445 before be306b8d9143a9c076c804a7ca025d69caf9c448; affected b46acd6a6a627d876898e1c84d3f84902264b445 before 36feda687afebae24c472202694448738809c411; affected b46acd6a6a627d876898e1c84d3f84902264b445 before 3e127829e57f5190f612412ece4541cb96d5ec7a |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1
- https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac
- https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d
- https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd
- https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448
- https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411
- https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a
ADP enrichment
No English description supplied.
No references supplied.