Answer in brief
CVE-2026-64532 records a High severity (CVSS 7.8) vulnerability in fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=b46acd6a6a627d876898e1c84d3f84902264b445 <b20e5a709d8bd190d6e4645606763c7423e694c1 || >=b46acd6a6a627d876898e1c84d3f84902264b445 <d41b382068ca4e64e421f736cdd700095464b6ac || >=b46acd6a6a627d876898e1c84d3f84902264b445 <429d653ca641d38a78609b8f62e81a0a5c780a2d || >=b46acd6a6a627d876898e1c84d3f84902264b445 <315d3a9a48b49f889da3d858a9307e677cb9e1bd || >=b46acd6a6a627d876898e1c84d3f84902264b445 <be306b8d9143a9c076c804a7ca025d69caf9c448 || >=b46acd6a6a627d876898e1c84d3f84902264b445 <36feda687afebae24c472202694448738809c411 || >=b46acd6a6a627d876898e1c84d3f84902264b445 <3e127829e57f5190f612412ece4541cb96d5ec7a | b20e5a709d8bd190d6e4645606763c7423e694c1, d41b382068ca4e64e421f736cdd700095464b6ac, 429d653ca641d38a78609b8f62e81a0a5c780a2d, 315d3a9a48b49f889da3d858a9307e677cb9e1bd, be306b8d9143a9c076c804a7ca025d69caf9c448, 36feda687afebae24c472202694448738809c411, 3e127829e57f5190f612412ece4541cb96d5ec7a |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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" (<[email protected]>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks.
Quoted source text, attributed separately from HOL analysis.