Answer in brief
CVE-2026-72310 records a High severity (CVSS 8.1) vulnerability in smb: client: fix overflow in passthrough ioctl bounds check. 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 8.1. 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 | >=2b1116bbe898aefdf584838448c6869f69851e0f <175357ee0c596cb82054650dfa32fda51ad35aaa || >=2b1116bbe898aefdf584838448c6869f69851e0f <dbd126539c098dba3159ce7d34b10b2daddcbd0f || >=2b1116bbe898aefdf584838448c6869f69851e0f <63feb687e89a3a52a31e6e01764117cc500f1974 || >=2b1116bbe898aefdf584838448c6869f69851e0f <160045fc943f6c46b227644261252c8a22b8a87a || >=2b1116bbe898aefdf584838448c6869f69851e0f <b30771b69eafae750afb7385fbcc3d77ed3f3670 || >=2b1116bbe898aefdf584838448c6869f69851e0f <1627e7d5c9b09721a141d07cedb178882f1ded67 || >=2b1116bbe898aefdf584838448c6869f69851e0f <1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9 || >=2b1116bbe898aefdf584838448c6869f69851e0f <a4f27ad055392fa164f5649e89a3637b033c5fcc || 2005c32ec99ee2490e8131b3953f3f212009ffea || >=5.4.69 <5.5 | 175357ee0c596cb82054650dfa32fda51ad35aaa, dbd126539c098dba3159ce7d34b10b2daddcbd0f, 63feb687e89a3a52a31e6e01764117cc500f1974, 160045fc943f6c46b227644261252c8a22b8a87a, b30771b69eafae750afb7385fbcc3d77ed3f3670, 1627e7d5c9b09721a141d07cedb178882f1ded67, 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9, a4f27ad055392fa164f5649e89a3637b033c5fcc, 5.5 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.
Quoted source text, attributed separately from HOL analysis.