CVE-2021-46906

MEDIUM
Published Feb 26, 2024 Modified Dec 10, 2025 CWE-668

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().

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CVSS v3.1 Score

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

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82 https://git.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8 https://git.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429ce https://git.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799f https://git.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1 https://git.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0 https://git.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9 https://git.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366 https://git.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82 https://git.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8 https://git.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429ce https://git.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799f https://git.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1 https://git.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0 https://git.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9 https://git.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366

Frequently Asked Questions

What is 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(). It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-46906? +
CVE-2021-46906 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-46906? +
CVE-2021-46906 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-46906? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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