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CVE-2026-63896

kernel: usb: gadget: composite: fix integer underflow in WebUSB GET_URL handling

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · August 7, 2026

Description

A flaw was found in the Linux kernel's USB gadget composite driver. A remote attacker, acting as a malicious USB host, could send a specially crafted GET_URL request. This request, with a small wLength value, triggers an integer underflow when calculating the buffer length for a memory copy operation. This leads to an out-of-bounds write, causing memory corruption and potentially a denial of service or arbitrary code execution.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-787 · Out-of-bounds Write