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      "text" : "An update for dhcpcd is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "text" : "The dhcpcd package provides a minimalistic network configuration daemon that supports IPv4 and IPv6 configuration including configuration discovery through NDP, DHCPv4 and DHCPv6 protocols.\n\nSecurity Fix(es):\n\n* dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length IPv6 ND option in Router Advertisement handling (CVE-2026-14258)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "category" : "description",
      "text" : "A flaw was found in dhcpcd's IPv6 Neighbor Discovery Router Advertisement processing. A specially crafted IPv6 Router Advertisement containing a zero-length Neighbor Discovery option can bypass validation during packet storage and later be reparsed without adequate validation, causing the parser to enter a non-advancing loop. Successful exploitation may result in excessive CPU consumption, leading to a denial of service.",
      "title" : "Vulnerability description"
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      "text" : "dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length IPv6 ND option in Router Advertisement handling",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat Product Security has rated this vulnerability as Moderate. Exploitation requires an adjacent unauthenticated attacker to send a specially crafted IPv6 Router Advertisement from the same Layer-2 network segment to a system running dhcpcd with IPv6 Router Advertisement processing enabled. Because Router Advertisements are processed automatically by dhcpcd, no additional user interaction or prior authentication is required. Successful exploitation can cause dhcpcd to repeatedly process the malformed Router Advertisement, resulting in excessive CPU utilization and denial of service.\n\nThe root cause of this vulnerability is inconsistent validation during Router Advertisement processing. While malformed Neighbor Discovery options are detected during the initial parsing stage, a specially crafted packet may already have been retained for subsequent processing. \n\n```\nEarlier upstream release 75289ca (dhcpcd v10.2.0) addressed this by immediately discarding malformed Router Advertisements before they could be reparsed. Subsequent upstream changes (805fe4ac) further strengthened the implementation by validating all Neighbor Discovery options before storing the packet, improving the overall robustness of the parsing logic.\n\nOnly Red Hat Enterprise Linux 10 and Red Hat In Vehicle OS ships \"dhcpcd\". Both products are shipped with affected versions.\n\n```",
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      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "category" : "external",
      "summary" : "https://github.com/NetworkConfiguration/dhcpcd/commit/75289ca",
      "url" : "https://github.com/NetworkConfiguration/dhcpcd/commit/75289ca"
    }, {
      "category" : "external",
      "summary" : "https://github.com/NetworkConfiguration/dhcpcd/issues/415",
      "url" : "https://github.com/NetworkConfiguration/dhcpcd/issues/415"
    } ],
    "release_date" : "2024-12-01T00:00:00+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-08-12T08:14:44+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
      "product_ids" : [ "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.src", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.x86_64" ],
      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:54210"
    }, {
      "category" : "workaround",
      "details" : "Until an updated package is available, administrators should disable IPv6 Router Advertisement processing on interfaces where it is not required or restrict acceptance of untrusted ICMPv6 Router Advertisements using appropriate network filtering. \n\nSystems that rely on IPv6 Stateless Address Autoconfiguration (SLAAC) or Router Advertisement-based network configuration should carefully evaluate the operational impact before applying these mitigations.",
      "product_ids" : [ "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.src", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.x86_64" ]
    } ],
    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "ADJACENT_NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 6.5,
        "baseSeverity" : "MEDIUM",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
      },
      "products" : [ "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.src", "BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.x86_64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.aarch64", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.ppc64le", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.s390x", "BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.x86_64" ]
    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Moderate"
    } ],
    "title" : "dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length IPv6 ND option in Router Advertisement handling"
  } ]
}