CVE-2026-18728 MEDIUM

CVE-2026-18728: Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-191
Published August 13, 2026
Last update August 13, 2026

CVSS base score

6.5/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 13, 2026 CVE published