CVE-2026-72310

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.