A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, restrict network access to `iscsiuio`-managed interfaces. Configure firewall rules to limit DHCP/BOOTP traffic to only trusted infrastructure within the local broadcast domain. This reduces the exposure to untrusted systems that could send crafted IPv4 DHCP packets. If `iscsiuio` is actively using IPv4 DHCP, consider reconfiguring it to use static IP addresses or a different network configuration if feasible. Changes to network configuration may require a service restart.

History

Fri, 14 Aug 2026 23:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 13 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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

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

Thu, 13 Aug 2026 03:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic.
Title Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-191
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: 2026-08-14T22:24:20.561Z

Reserved: 2026-08-03T17:55:57.114Z

Link: CVE-2026-18728

cve-icon Vulnrichment

Updated: 2026-08-14T22:24:14.895Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-08-13T04:17:19.340

Modified: 2026-08-14T23:16:31.977

Link: CVE-2026-18728

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-12T18:05:24Z

Links: CVE-2026-18728 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T10:39:06Z

Weaknesses