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

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.

Open-iSCSI Open-iSCSI是Open-iSCSI组织开源的一个网络存储连接工具。 Open-iSCSI存在数字错误漏洞，该漏洞源于iscsiuio组件在IPv4 DHCP解析过程中存在整数下溢，可能导致同一本地网段的远程攻击者通过发送特制的IPv4/UDP DHCP回复触发越界读取，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-18728

Vulnerability Information
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Vulnerability Title
Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
Open-iSCSI 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-iSCSI Open-iSCSI是Open-iSCSI组织开源的一个网络存储连接工具。 Open-iSCSI存在数字错误漏洞，该漏洞源于iscsiuio组件在IPv4 DHCP解析过程中存在整数下溢，可能导致同一本地网段的远程攻击者通过发送特制的IPv4/UDP DHCP回复触发越界读取，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-18728

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III. Intelligence Information for CVE-2026-18728

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Vendor Advisories for CVE-2026-18728 (2)

Same Patch Batch · Red Hat · 2026-08-13 · 6 CVEs total

CVE-2026-73266 7.1 HIGH Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagate
CVE-2026-73583 6.6 MEDIUM Sblim-sfcb: unsafe deserialization in sblim-sfcb provider-manager ipc allows out-of-bounds
CVE-2026-73585 6.3 MEDIUM Sblim-cmpi-base: insecure temporary file creation in sblim-cmpi-base provider registration
CVE-2026-73584 6.3 MEDIUM Sblim-sfcb: sblim-sfcb: privileged file corruption and denial of service via insecure temp
CVE-2026-19730 4.2 MEDIUM Podman: podman: quadlet install --replace non-truncating write retains removed host-access

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-191

V. Comments for CVE-2026-18728

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