CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's SMB client, specifically in the `smb2_ioctl_query_info()` function, which improperly validates the bounds of a response payload due to 32-bit arithmetic overflow. This flaw allows a malicious server to exploit the bounds check, potentially leading to unauthorized memory access and data leakage when copying data to user space. Organizations utilizing Linux systems with SMB functionality should prioritize addressing this vulnerability to mitigate the risk of exploitation.
Original NVD 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.