CVE-2026-72310
Description
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.
How to fix
- Linux Linux175357ee0c596cb82054650dfa32fda51ad35aaa, dbd126539c098dba3159ce7d34b10b2daddcbd0f, 63feb687e89a3a52a31e6e01764117cc500f1974, 160045fc943f6c46b227644261252c8a22b8a87a, b30771b69eafae750afb7385fbcc3d77ed3f3670, 1627e7d5c9b09721a141d07cedb178882f1ded67, 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9, a4f27ad055392fa164f5649e89a3637b033c5fcc, 5.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < 175357ee0c596cb82054650dfa32fda51ad35aaa, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < dbd126539c098dba3159ce7d34b10b2daddcbd0f, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < 63feb687e89a3a52a31e6e01764117cc500f1974, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < 160045fc943f6c46b227644261252c8a22b8a87a, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < b30771b69eafae750afb7385fbcc3d77ed3f3670, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < 1627e7d5c9b09721a141d07cedb178882f1ded67, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9, 2b1116bbe898aefdf584838448c6869f69851e0f ≤ v < a4f27ad055392fa164f5649e89a3637b033c5fcc, 2005c32ec99ee2490e8131b3953f3f212009ffea, 5.4.69 ≤ v < 5.5, 5.5 | 175357ee0c596cb82054650dfa32fda51ad35aaa, dbd126539c098dba3159ce7d34b10b2daddcbd0f, 63feb687e89a3a52a31e6e01764117cc500f1974, 160045fc943f6c46b227644261252c8a22b8a87a, b30771b69eafae750afb7385fbcc3d77ed3f3670, 1627e7d5c9b09721a141d07cedb178882f1ded67, 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9, a4f27ad055392fa164f5649e89a3637b033c5fcc, 5.5 |
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