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.

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Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, restrict ICMPv6 Router Advertisements from untrusted sources on any network segment where `iscsiuio` interfaces are exposed. Alternatively, disable IPv6 Router Advertisement processing on affected interfaces if not operationally required. This may involve configuring firewall rules to filter ICMPv6 type 134 messages or adjusting network interface settings to prevent RA-driven IPv6 configuration. A service restart may be required for changes to take effect.

History

Thu, 13 Aug 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat open Iscsi
Vendors & Products Redhat open Iscsi

Wed, 12 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-835
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-12T21:13:47.604Z

Reserved: 2026-08-03T17:55:50.945Z

Link: CVE-2026-18726

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T22:17:14.557

Modified: 2026-08-12T22:17:14.557

Link: CVE-2026-18726

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T10:39:10Z

Weaknesses