CVE-2026-23442

kernel: ipv6: add NULL checks for idev in SRv6 paths

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · April 3, 2026

Updated · October 9, 2026

Description

A flaw was found in the Linux kernel. Missing null pointer checks in the IPv6 Segment Routing (SRv6) implementation, specifically within the seg6_hmac_validate_skb() and ipv6_srh_rcv() functions, can occur when an IPv6 device lacks proper configuration. This oversight may allow an attacker to trigger a null pointer dereference, potentially leading to a system crash and 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 · 6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference