CVE-2021-46906

MediumCVSS 5.5/10Last modified Jun 17, 2026

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().

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-668

Affected software

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c5d3c142f2d57d40c55e65d5622d319125a45366; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 41b1e71a2c57366b08dcca1a28b0d45ca69429ce; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8c064eece9a51856f3f275104520c7e3017fc5c0; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0e280502be1b003c3483ae03fc60dea554fcfa82; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b1e3596416d74ce95cc0b7b38472329a3818f8a9; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 21883bff0fd854e07429a773ff18f1e9658f50e8; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6be388f4a35d2ce5ef7dbf635a8964a5da7f799f
LinuxLinux2.6.12

References

Timeline

Published
Feb 26, 2024
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-46906: Medium severity, CVSS 5.5 | Vulnix