CVE-2026-63899
Received Received - Intake

USB Serial mxuport Memory Corruption Fix

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-63899
EUVD
EUVD-2026-45672

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a memory corruption issue in the USB serial driver for mxuport devices. It occurs when a malicious USB device reports a small bulk-out endpoint max packet size, potentially leading to slab corruption in the kernel memory.

Detection Guidance

This vulnerability is specific to the Linux kernel's USB serial driver (mxuport) and requires checking kernel logs for USB device errors or memory corruption events. Use 'dmesg | grep mxuport' or 'journalctl -k | grep mxuport' to inspect kernel logs for related errors.

Impact Analysis

This vulnerability could allow an attacker with physical access to a system to trigger memory corruption by plugging in a malicious USB device. This might lead to system crashes, privilege escalation, or other unintended behavior depending on the kernel's memory state.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel memory corruption issue in USB serial drivers. Compliance impacts would only occur if exploitation led to unauthorized data access or system compromise, which is not specified here.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for CVE-2026-63899. Avoid connecting untrusted USB devices to the system until the update is applied.

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