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CVE-2026-23439

kernel: udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · April 3, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel. A privileged local user can exploit a vulnerability in the udp_tunnel module when IPv6 (Internet Protocol version 6) is disabled. This occurs because the udp_sock_create6() function incorrectly returns success without creating a socket, leading to a NULL pointer dereference. This can cause the system to crash, resulting in a Denial of Service (DoS).

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference