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

Summary

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.

Timeline

1. Sep 11, 2026, 7:45 PM UTCCVE published
2. Oct 19, 2026, 8:49 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 9d8d51735a3af40b722346931a6a1e50227df4b5 · fixed in 6fcefe71aeb524f6e77fe586fe85d873745e917c; From 9d8d51735a3af40b722346931a6a1e50227df4b5 · fixed in ee8ad1bb1e96164d51089b1182f1bd5f187e7baa; From 9d8d51735a3af40b722346931a6a1e50227df4b5 · fixed in a59cf84441f9a17323c89452cec2bf16724c48a9

• Linux Linux

  6.14

• KernelLinux

  From 6.14.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 3