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CVE-2026-63898

kernel: USB: serial: mct_u232: fix memory corruption with small endpoint

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 31, 2026

Description

A flaw was found in the Linux kernel's mct_u232 USB serial driver. A malicious USB device could exploit this vulnerability by reporting a smaller endpoint maximum packet size than the driver expects. This incorrect handling of transfer sizes can lead to memory corruption, potentially allowing an attacker to cause system instability or execute arbitrary code.

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