Tracker / CVE-2021-46906
CVE-2021-46906
Medium 5.5
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 and versions
| linux | linux_kernel · … → 4.4.274 |
|---|---|
| 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 · 4.5.0 → 4.9.274 |
| linux | linux_kernel · 5.11.0 → 5.12.12 |
| linux | linux_kernel · 5.5.0 → 5.10.45 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.