---
id: CVE-2026-115486
title: >-
  Open-iscsi: open-iscsi: ipv6 neighbor discovery missing option length
  validation in iscsiuio allows arp table poisoning
summary: >-
  A flaw was found in the iscsiuio component of open-iscsi. The IPv6 Neighbor
  Discovery handler accesses link-layer address options at a fixed offset
  without verifying the packet contains them. Additionally, the ARP table is
  updated uncond…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-125
vendor: Red Hat
product: iscsi-initiator-utils
affected:
  - iscsi-initiator-utils (all versions)
  - iscsi-initiator-utils
  - iscsi-initiator-utils (all versions)
  - iscsi-initiator-utils (all versions)
  - iscsi-initiator-utils (all versions)
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T00:16:34.250Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115486'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-115486'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2556267'
    label: RHBZ#2556267
tags:
  - cve.org
ingestedAt: '2026-10-23T01:11:52.505Z'
---

## Overview

A flaw was found in the iscsiuio component of open-iscsi. The IPv6 Neighbor Discovery handler accesses link-layer address options at a fixed offset without verifying the packet contains them. Additionally, the ARP table is updated unconditionally with attacker-controlled addresses from the packet headers. An attacker on the same network segment can send a minimal Neighbor Advertisement to poison the ARP table and redirect network traffic.

## Affected

- `iscsi-initiator-utils (all versions)`
- `iscsi-initiator-utils`
- `iscsi-initiator-utils (all versions)`
- `iscsi-initiator-utils (all versions)`
- `iscsi-initiator-utils (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Keep iscsiuio-managed interfaces on trusted L2 segments only. Where operationally acceptable, filter ICMPv6 Neighbor Advertisement (type 136) and Neighbor Solicitation (type 135) messages from untrusted sources using firewall rules.