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CVE-2026-63956

kernel: USB: serial: cypress_m8: fix memory corruption with small endpoint

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Severity

Important

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · November 4, 2026

Description

A flaw was found in the Linux kernel's cypress_m8 USB serial driver. A malicious Universal Serial Bus (USB) device could report a packet size smaller than eight bytes for the interrupt-out endpoint. This can lead to memory corruption, specifically user-controlled slab corruption or a NULL-pointer dereference, potentially impacting system stability and integrity.

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