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CVE-2026-115486— Open-iscsi: open-iscsi: ipv6 neighbor discovery missing option length validation in iscsiuio allows arp table poisoning

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 open-iscsi 的 iscsiuio 组件中发现了一个漏洞。IPv6 邻居发现（Neighbor Discovery）处理程序在未验证数据包是否包含链路层地址选项的情况下，以固定偏移量访问这些选项。此外，ARP 表会被无条件地更新为来自数据包头的、由攻击者控制的地址。同一网段上的攻击者可以发送一个最小化的邻居通告（Neighbor Advertisement）来污染 ARP 表，从而重定向网络流量。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2026-115486

Vulnerability Information
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Vulnerability Title
Open-iscsi: open-iscsi: ipv6 neighbor discovery missing option length validation in iscsiuio allows arp table poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-115486

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III. Intelligence Information for CVE-2026-115486

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Other References for CVE-2026-115486 (1)

Same Patch Batch · Red Hat · 2026-10-23 · 3 CVEs total

CVE-2026-115484 7.6 HIGH Open-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg
CVE-2026-115485 6.3 MEDIUM Open-iscsi: open-iscsi: dhcpv6 vendor option strlen heap out-of-bounds read and 1-byte wri

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-115486

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