CVE-2026-23304

kernel: ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · March 25, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel. A local attacker could cause a null pointer dereference in the IPv6 routing subsystem when a slave device is being un-slaved from a Virtual Routing and Forwarding (VRF) instance. This vulnerability can lead to a system crash, resulting in a denial of service.

Statement

This flaw affects systems using VRF (Virtual Routing and Forwarding) with IPv6. The race occurs when a device is being removed from a VRF while IPv6 route lookups are in progress. The missing fallback to loopback_dev causes a NULL pointer dereference. Exploiting this requires the ability to configure VRF interfaces while traffic is flowing.

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