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6.5 Medium

CVE-2026-18726 Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing

Description

A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.

CVSS 3.1 detail

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

Exploitable from the adjacent network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Adjacent network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 9 Versions not published

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