CVE-2021-46906

In the Linux kernel, the following vulnerability has been resolved: HID: usbhid: fix info leak in hid_submit_ctrl In hid_submit_ctrl(), the way of calculating the report length doesn't take into account that report->size can be zero. When running the syzkaller reproducer, a report of size 0 causes hid_submit_ctrl) to calculate transfer_buffer_length as 16384. When this urb is passed to the usb core layer, KMSAN reports an info leak of 16384 bytes. To fix this, first modify hid_report_len() to account for the zero report size case by using DIV_ROUND_UP for the division. Then, call it from hid_submit_ctrl().

• linux linux kernel (< 4.4.274) • linux linux kernel (>= 4.5.0 < 4.9.274) • linux linux kernel (>= 4.10.0 < 4.14.238) • linux linux kernel (>= 4.15.0 < 4.19.196) • linux linux kernel (>= 4.20.0 < 5.4.127) • linux linux kernel (>= 5.5.0 < 5.10.45) • linux linux kernel (>= 5.11.0 < 5.12.12)