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CVE-2021-46906

5.5 · MEDIUM

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…

Published Feb 26, 2024CWE-668EPSS 0.24%

Overview

CVE-2021-46906 is a medium-severity vulnerability. It was published on February 26, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82Refgit.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8Refgit.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429ceRefgit.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799fRefgit.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1Refgit.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0Refgit.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9Refgit.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366Refgit.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82Refgit.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46906?

CVE-2021-46906 is a medium-severity vulnerability. It was published on February 26, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46906?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46906?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46906?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46906 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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