# CVE-2021-46906: linux: In the Linux kernel, the following vulnerability has been resolved:  HID: usbhid: fix info leak in hid_submit_ctrl  I...

CVE-2021-46906 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46906, released February 26, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46906
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2024

## Description

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().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-46906](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46906.md) | Feb 26, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-46906](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46906.md) | Feb 26, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-46906](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46906.md) | Feb 26, 2024 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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