CVE-2021-46906: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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().

Affected products

• Linux Linux Kernel: before 4.4.274 (fixed in 4.4.274); from 4.5.0, before 4.9.274 (fixed in 4.9.274); from 4.10.0, before 4.14.238 (fixed in 4.14.238); from 4.15.0, before 4.19.196 (fixed in 4.19.196); from 4.20.0, before 5.4.127 (fixed in 5.4.127); from 5.5.0, before 5.10.45 (fixed in 5.10.45); …

Published 2024-02-26. Last modified 2026-06-17.