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CVE-2026-63957

kernel: USB: serial: safe_serial: 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. A malicious Universal Serial Bus (USB) device can exploit a vulnerability in the safe_serial driver by reporting a bulk-out buffer size smaller than eight bytes. This can lead to user-controlled slab corruption, a form of memory corruption, when the driver operates in 'safe' mode.

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-131 · Incorrect Calculation of Buffer Size