Vulnerability-Lookup

GHSA-R2JJ-8GWV-75PJ

Vulnerability from github – Published: 2026-10-15 06:30 – Updated: 2026-10-16 06:30

Details

In DragonFly BSD through 6.4.2 before 4bb22ff, the ARP input handlers arpintr() and in_arpinput() (sys/netinet/if_ether.c) do not validate the hardware address length (ar_hln) and protocol address length (ar_pln) fields of incoming ARP packets. in_arpreply() then uses these attacker-controlled values as memcpy lengths when copying from kernel buffers that are only 6 and 4 bytes long, resulting in an out-of-bounds read of kernel heap and stack memory that is copied into the ARP reply sent back to the requester. An unauthenticated attacker on the adjacent network can use a single crafted ARP request to disclose up to roughly 250 bytes of each type of kernel memory, including kernel pointers. This is expected to be fixed in the 6.6 stable release when that is available.

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-110912"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-130"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-15T04:18:23Z",
    "severity": "HIGH"
  },
  "details": "In DragonFly BSD through 6.4.2 before 4bb22ff, the ARP input handlers arpintr() and in_arpinput() (sys/netinet/if_ether.c) do not validate the hardware address length (ar_hln) and protocol address length (ar_pln) fields of incoming ARP packets. in_arpreply() then uses these attacker-controlled values as memcpy lengths when copying from kernel buffers that are only 6 and 4 bytes long, resulting in an out-of-bounds read of kernel heap and stack memory that is copied into the ARP reply sent back to the requester. An unauthenticated attacker on the adjacent network can use a single crafted ARP request to disclose up to roughly 250 bytes of each type of kernel memory, including kernel pointers. This is expected to be fixed in the 6.6 stable release when that is available.",
  "id": "GHSA-r2jj-8gwv-75pj",
  "modified": "2026-10-16T06:30:23Z",
  "published": "2026-10-15T06:30:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110912"
    },
    {
      "type": "WEB",
      "url": "https://github.com/DragonFlyBSD/DragonFlyBSD/commit/4bb22ffcf2e9fb44995fbfd9945194afc87fb182"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dreamfast/CVE-2026-110912"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-110912 (GCVE-0-2026-110912)

Vulnerability from cvelistv5 – Published: 2026-10-15 03:23 – Updated: 2026-10-16 03:02

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 13:18 UTC

CWE

CWE-130 - Improper Handling of Length Parameter Inconsistency

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2349 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/DragonFlyBSD/DragonFlyBSD/comm…
https://github.com/dreamfast/CVE-2026-110912

Impacted products

1 product

Vendor	Product	Version
DragonFlyBSD	DragonFlyBSD	Affected: 984263bcb83ad82313113c6ac840d99124d8f90c , < 4bb22ffcf2e9fb44995fbfd9945194afc87fb182 (git) cpe:2.3:o:dragonflybsd:dragonflybsd::::::::

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-110912",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T13:18:21.303116Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T13:18:31.851Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "IPv4 ARP (sys/netinet)"
          ],
          "product": "DragonFlyBSD",
          "programFiles": [
            "sys/netinet/if_ether.c"
          ],
          "programRoutines": [
            {
              "name": "arpintr()"
            },
            {
              "name": "in_arpinput()"
            },
            {
              "name": "in_arpreply()"
            }
          ],
          "repo": "https://github.com/DragonFlyBSD/DragonFlyBSD",
          "vendor": "DragonFlyBSD",
          "versions": [
            {
              "lessThan": "4bb22ffcf2e9fb44995fbfd9945194afc87fb182",
              "status": "affected",
              "version": "984263bcb83ad82313113c6ac840d99124d8f90c",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "providerMetadata": {
        "dateUpdated": "2026-10-16T03:02:31.851Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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      "references": [
        {
          "url": "https://github.com/DragonFlyBSD/DragonFlyBSD/commit/4bb22ffcf2e9fb44995fbfd9945194afc87fb182"
        },
        {
          "url": "https://github.com/dreamfast/CVE-2026-110912"
        }
      ],
      "solutions": [
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              "type": "text/html",
              "value": "Update to DragonFly BSD 6.6 once released (the maintainers have confirmed the fix will be included), or apply commit 4bb22ffcf2e9fb44995fbfd9945194afc87fb182 from master, which rejects ARP packets whose \u003ccode\u003ear_hln\u003c/code\u003e is not \u003ccode\u003eETHER_ADDR_LEN\u003c/code\u003e in \u003ccode\u003earpintr()\u003c/code\u003e and whose \u003ccode\u003ear_pln\u003c/code\u003e is not \u003ccode\u003esizeof(struct in_addr)\u003c/code\u003e in \u003ccode\u003ein_arpinput()\u003c/code\u003e."
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        }
      ],
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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-110912",
    "datePublished": "2026-10-15T03:23:47.830Z",
    "dateReserved": "2026-10-15T03:23:47.465Z",
    "dateUpdated": "2026-10-16T03:02:31.851Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.
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