Vulnerability-Lookup

UBUNTU-CVE-2026-18728 (CVE-2026-18728)

Vulnerability from osv_ubuntu – Published: 2026-08-13 04:17 – Updated: 2026-08-19 11:01 – Source website

Details

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.

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-18728	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-18728	REPORT
	https://access.redhat.com/security/cve/CVE-2026-18728	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2463029	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "open-iscsi",
            "binary_version": "2.0.873-3ubuntu9"
          },
          {
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      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
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        "purl": "pkg:deb/ubuntu/open-iscsi@2.0.873-3ubuntu9?arch=source\u0026distro=trusty"
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      },
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        "2.0.873+git0.3b4b4500-14ubuntu3",
        "2.0.873+git0.3b4b4500-14ubuntu3.1",
        "2.0.873+git0.3b4b4500-14ubuntu3.2",
        "2.0.873+git0.3b4b4500-14ubuntu3.3",
        "2.0.873+git0.3b4b4500-14ubuntu3.4",
        "2.0.873+git0.3b4b4500-14ubuntu3.5",
        "2.0.873+git0.3b4b4500-14ubuntu3.6",
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      ]
    },
    {
      "ecosystem_specific": {
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          {
            "binary_name": "iscsiuio",
            "binary_version": "2.0.874-5ubuntu2.11+esm1"
          },
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            "binary_version": "2.0.874-5ubuntu2.11+esm1"
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      },
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        "name": "open-iscsi",
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        "2.0.874-4ubuntu5",
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        "2.0.874-5ubuntu2",
        "2.0.874-5ubuntu2.1",
        "2.0.874-5ubuntu2.2",
        "2.0.874-5ubuntu2.3",
        "2.0.874-5ubuntu2.4",
        "2.0.874-5ubuntu2.6",
        "2.0.874-5ubuntu2.7",
        "2.0.874-5ubuntu2.9",
        "2.0.874-5ubuntu2.10",
        "2.0.874-5ubuntu2.11",
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      ]
    },
    {
      "ecosystem_specific": {
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          {
            "binary_name": "iscsiuio",
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          },
          {
            "binary_name": "open-iscsi",
            "binary_version": "2.0.874-7.1ubuntu6.5"
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        ]
      },
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        "name": "open-iscsi",
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      },
      "ranges": [
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        "2.0.874-7.1ubuntu6.1",
        "2.0.874-7.1ubuntu6.2",
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          {
            "binary_name": "iscsiuio",
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      },
      "ranges": [
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            {
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        "2.1.4-0ubuntu2",
        "2.1.4-0ubuntu3",
        "2.1.4-0ubuntu4",
        "2.1.5-1ubuntu1",
        "2.1.5-1ubuntu1.1"
      ]
    },
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            "binary_name": "libopeniscsiusr",
            "binary_version": "2.1.9-3ubuntu5.4"
          },
          {
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        "2.1.9-3ubuntu5.3",
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
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            "binary_version": "2.1.11-3ubuntu3"
          },
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            "binary_version": "2.1.11-3ubuntu3"
          },
          {
            "binary_name": "open-iscsi",
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      },
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        "2.1.11-3ubuntu2",
        "2.1.11-3ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-18728",
  "modified": "2026-08-19T11:01:27Z",
  "published": "2026-08-13T04:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-18728"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18728"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18728"
    },
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      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463029"
    }
  ],
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  "schema_version": "1.7.0",
  "severity": [
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      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-18728"
  ]
}

CVE-2026-18728 (GCVE-0-2026-18728)

Vulnerability from cvelistv5 – Published: 2026-08-13 03:13 – Updated: 2026-08-18 14:37

Title

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

Summary

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.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 22:24 UTC

CWE

CWE-191 - Integer Underflow (Wrap or Wraparound)

Assigner

redhat redhat root

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-18728	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2463029	issue-trackingx_refsource_REDHAT

Impacted products

2 products

Vendor	Product	Version
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

Date Public

2026-08-12 18:05

Credits

This issue was discovered by In partnership with Red Hat (Aisle.com) and Keith Linneman (Linneman Labs).

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.