CVE-2025-38103: HID: usbhid: Eliminate recurrent out-of-bounds bug in usbhid_parse()

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-03 · updated 2026-06-17
Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: HID: usbhid: Eliminate recurrent out-of-bounds bug in usbhid_parse() Update struct hid_descriptor to better reflect the mandatory and optional parts of the HID Descriptor as per USB HID 1.11 specification. Note: the kernel currently does not parse any optional HID class descriptors, only the mandatory report descriptor. Update all references to member element desc[0] to rpt_desc. Add test to verify bLength and bNumDescriptors values are valid. Replace the for loop with direct access to the mandatory HID class descriptor member for the report descriptor. This eliminates the possibility of getting an out-of-bounds fault. Add a warning message if the HID descriptor contains any unsupported optional HID class descriptors.

Affected products

Debian Linux: 11.0
Linux kernel: from 3.2.95 before 3.3; from 3.16.50 before 3.17; from 3.18.76 before 3.19; from 4.1.46 before 4.2; from 4.4.93 before 4.5; from 4.9.57 before 4.10 — fixed in 3.17, 3.19, 3.3, 4.10, 4.14, 4.2

How to fix

Upgrade to a fixed version: Linux kernel 3.17, 3.19, 3.3, 4.10. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-38103 or the next vulnerability affects your stack