{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
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      "contact_details": "https://tuxcare.com/contact/",
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/oraclelinux6els/vex/2026/cve-2026-18103-els_os-oraclelinux6els.json"
      }
    ],
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      "current_release_date": "2026-10-20T09:11:01Z",
      "generator": {
        "date": "2026-10-20T09:11:01Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-18103-ELS_OS-ORACLELINUX6ELS",
      "initial_release_date": "2026-08-05T00:16:00Z",
      "revision_history": [
        {
          "date": "2026-08-05T00:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-10-19T21:05:06Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-10-20T09:11:01Z",
          "number": "3",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "3"
    },
    "title": "Security update on CVE-2026-18103"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-18103",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"
      },
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
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          "Oracle-Linux-6:dhclient-12:4.1.1-64.P1.0.1.el6.x86_64",
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          "Oracle-Linux-6:dhcp-devel-12:4.1.1-64.P1.0.1.el6.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-18103"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-18103",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18103"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2508081",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508081"
        }
      ],
      "release_date": "2026-08-05T00:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-20T08:47:15.006917Z",
          "details": "Exploitation is limited to the dhcpd OMAPI control port, which is not active unless explicitly configured (omapi-port) and requires authenticated OMAPI access (PR:H) or an intentionally unauthenticated OMAPI exposure to send the malicious lease-creation request. The bug is availability-only (persistent crash) and hinges on a crafted InfiniBand hardware-address field, with no confidentiality or integrity impact. Accordingly, only hosts that both run ISC dhcpd and deliberately expose OMAPI are in scope, so the practical risk in managed VM/server environments is low and this issue can be safely deprioritized.",
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