Vulnerability-Lookup

RHSA-2026:54210

Vulnerability from csaf_opensuse - Published: 2026-08-12 08:14 - Updated: 2026-08-12 15:49

Summary

Red Hat Security Advisory: dhcpcd security update

Severity

Moderate

Notes

Topic: An update for dhcpcd is now available for Red Hat Enterprise Linux 10. Red 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.

Details: The dhcpcd package provides a minimalistic network configuration daemon that supports IPv4 and IPv6 configuration including configuration discovery through NDP, DHCPv4 and DHCPv6 protocols. Security Fix(es): * dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length IPv6 ND option in Router Advertisement handling (CVE-2026-14258) For 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.

Terms of Use: 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 Red Hat Inc. and provide a link to the original.

CVE-2026-14258

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.

6.5 (Medium)


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

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-0:10.0.6-11.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debuginfo-0:10.0.6-11.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:dhcpcd-debugsource-0:10.0.6-11.el10_2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:54210	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2462305	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-14258	self
https://bugzilla.redhat.com/show_bug.cgi?id=2462305	external
https://www.cve.org/CVERecord?id=CVE-2026-14258	external
https://nvd.nist.gov/vuln/detail/CVE-2026-14258	external
https://github.com/NetworkConfiguration/dhcpcd/co…	external
https://github.com/NetworkConfiguration/dhcpcd/is…	external

Acknowledgments

AISLE Research

JSON

To clipboard

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        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dhcpcd\u0027s 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"
        },
        {
          "category": "summary",
          "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```",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "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"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-14258"
        },
        {
          "category": "external",
          "summary": "RHBZ#2462305",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462305"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-14258",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-14258"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-14258",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14258"
        },
        {
          "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"
    }
  ]
}

CVE-2026-14258 (GCVE-0-2026-14258)

Vulnerability from cvelistv5 – Published: 2026-07-01 09:24 – Updated: 2026-08-12 15:49

Title

Dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length ipv6 nd option in router advertisement handling

Summary

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: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 12:20 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

redhat redhat root Scorecard

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:54210	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-14258	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2462305	issue-trackingx_refsource_REDHAT
https://github.com/NetworkConfiguration/dhcpcd/co…
https://github.com/NetworkConfiguration/dhcpcd/is…

Impacted products

1 product

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:10.0.6-11.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2

Date Public

2024-12-01 00:00

Credits

Red Hat would like to thank AISLE Research for reporting this issue.

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-14258",
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T12:20:39.579180Z",
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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.

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.

Action not permitted

RHSA-2026:54210

CVE-2026-14258 (GCVE-0-2026-14258)

Tags

Sightings

Nomenclature

Related by attack behaviour