CVE-2026-31623

kernel: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

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Severity

Moderate

Red Hat Product Security

7.1

CVSS 3.1

Review impact separately from score.

Published · April 24, 2026

Updated · June 9, 2026

Description

A flaw was found in the Linux kernel's cdc-phonet driver. A malicious USB device, pretending to be a CDC Phonet modem, can exploit this vulnerability by sending an unlimited number of large data transfers. This can cause an overflow in the kernel's internal data buffer (skb_shared_info->frags[] array), leading to a Denial of Service (DoS) condition where the system may become unresponsive or crash.

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 · 7.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')