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open-iscsi iscsiuio CVE-2026-18727

| EUVDEUVD-2026-57637 MEDIUM
Integer Underflow (CWE-191)
2026-08-12 redhat GHSA-g663-r6hr-qmc2
Integer Overflow Buffer Overflow Denial Of Service Microsoft Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 9
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Adjacent-network vector required, no authentication needed, impact is DoS-only via iscsiuio crash; fully consistent with the vendor-provided vector.

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 12, 2026 - 21:55 vuln.today
CVE Published
Aug 12, 2026 - 21:13 cve.org
MEDIUM 6.5

DescriptionCVE.org

A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.

AnalysisAI

Integer underflow in open-iscsi's iscsiuio daemon crashes the process when parsing malformed DHCPv6 Advertise packets with a truncated UDP length field, disrupting iSCSI storage connectivity. Systems running Red Hat Enterprise Linux 9 and 10 with iscsiuio actively engaged in a DHCPv6 exchange are exploitable by any unauthenticated attacker on the same adjacent network segment. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Vulnerability AssessmentAI

Exploitation The attacker must be on an adjacent network segment with IPv6 reachability to the target - this is not exploitable remotely over the internet, and the AV:A vector confines risk to the local broadcast domain or link-local scope. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 6.5 with AV:A (adjacent network) is well-calibrated: exploitation is not remotely possible over the open internet and requires the attacker to occupy the same Layer 2 or IPv6 link-local segment as the target. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Red Hat-provided update for the open-iscsi package on RHEL 9 and RHEL 10 via standard package management (dnf update open-iscsi) once released; monitor https://access.redhat.com/security/cve/CVE-2026-18727 for the patched package version, which is not confirmed in the current data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-191 – Integer Underflow

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Same technique Integer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
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CVE-2026-18727 vulnerability details – vuln.today
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