HID: intel-thc-hid: intel-quickspi: validate report size before copy

Overview

In the Linux kernel, the following vulnerability has been resolved:

HID: intel-thc-hid: intel-quickspi: validate report size before copy

write_cmd_to_txdma() builds an output report in qsdev->report_buf, a heap buffer allocated in quickspi_alloc_report_buf() to the device-descriptor derived max_report_len (a few hundred bytes for a touch controller). It copies the caller-supplied report into that buffer:

memcpy(write_buf->content, report_buf, report_buf_len);

The HID core caps a report at HID_MAX_BUFFER_SIZE (16384) by default, and quickspi_hid_ll_driver does not set max_buffer_size, so the length reaches the driver unbounded. A hidraw SET_REPORT/SET_FEATURE ioctl carrying a report larger than max_report_len therefore overflows report_buf with attacker-controlled length and content.

Record the report_buf allocation size and reject reports that do not fit before copying, matching the equivalent guard in the intel-quicki2c sibling (quicki2c_init_write_buf()) and the hid-goodix-spi fix.

write_cmd_to_txdma() writes the output report header ahead of the content in the same buffer, so size the allocation to cover the header as well. That keeps the added bound from rejecting a maximum-sized report.

Affected

• Linux >= 9d8d51735a3af40b722346931a6a1e50227df4b5 < 6fcefe71aeb524f6e77fe586fe85d873745e917c
• Linux >= 9d8d51735a3af40b722346931a6a1e50227df4b5 < ee8ad1bb1e96164d51089b1182f1bd5f187e7baa
• Linux >= 9d8d51735a3af40b722346931a6a1e50227df4b5 < a59cf84441f9a17323c89452cec2bf16724c48a9
• Linux 6.14

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Vendor advisories

• Red Hat VEX · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-27 · vex