CVE-2026-102715 (GCVE-0-2026-102715)

Vulnerability from cvelistv5 – Published: 2026-09-29 17:42 – Updated: 2026-09-29 18:42
VLAI
Title
mDNS string-cache lookup matches on slot size, so a peer name aliases a shorter one and the response encoder writes past the packet
Summary
Any host on the LAN can send two mDNS records and make the responder write past the end of its transmit packet. The string table stores each name in a slot rounded up to a multiple of four: ```c /* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */ memory_len = ((memory_len & 0xFFFFFFFC) + 8) & 0xFFFFFFFF; ... len = *((USHORT*)(p - 2)); /* slot size, not string length */ if ((len == memory_len) && ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...) ``` The lookup that decides whether an incoming name is already stored compares the rounded slot size, so names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered with the pointer to the first, and the record then carries a string up to three bytes longer than the length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only bound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string. Two PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names whose lengths fall in the same bucket: ``` ==87491==ERROR: AddressSanitizer: heap-buffer-overflow WRITE of size 1 at 0x611000000124 thread T5 #0 _nx_mdns_name_string_encode addons/mdns/nxd_mdns.c:13096 #1 _nx_mdns_packet_rr_add addons/mdns/nxd_mdns.c:8911 0x611000000124 is 0 bytes to the right of 228-byte region ``` The overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a normal pool that lands in the next packet in the same pool rather than in a redzone, so the visible effect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash. Compare the slot size against the stored string length before declaring a match, or keep the string length in the slot header and return it to the caller so the encoder and the bound check agree.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 18:41 UTC
CWE
Impacted products
Vendor Product Version CPE status
Eclipse Foundation eclipse-threadx/netxduo Affected: 0 , ≤ 6.5.1 (semver)
guessed Create a notification for this product.
Credits
Show details on NVD website

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                  "value": "\u003cp\u003eAny host on the LAN can send two mDNS records and make the responder write past the end of its\u003c/p\u003e\u003cp\u003etransmit packet.\u003c/p\u003e\u003cp\u003eThe string table stores each name in a slot rounded up to a multiple of four:\u003c/p\u003e\u003cp\u003e```c\u003c/p\u003e\u003cp\u003e/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */\u003c/p\u003e\u003cp\u003ememory_len = ((memory_len \u0026amp; 0xFFFFFFFC) + 8) \u0026amp; 0xFFFFFFFF;\u003c/p\u003e\u003cp\u003e...\u003c/p\u003e\u003cp\u003elen = *((USHORT*)(p - 2));           /* slot size, not string length */\u003c/p\u003e\u003cp\u003eif ((len == memory_len) \u0026amp;\u0026amp; ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eThe lookup that decides whether an incoming name is already stored compares the rounded slot size,\u003c/p\u003e\u003cp\u003eso names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered\u003c/p\u003e\u003cp\u003ewith the pointer to the first, and the record then carries a string up to three bytes longer than\u003c/p\u003e\u003cp\u003ethe length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only\u003c/p\u003e\u003cp\u003ebound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.\u003c/p\u003e\u003cp\u003eTwo PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names\u003c/p\u003e\u003cp\u003ewhose lengths fall in the same bucket:\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003e==87491==ERROR: AddressSanitizer: heap-buffer-overflow\u003c/p\u003e\u003cp\u003eWRITE of size 1 at 0x611000000124 thread T5\u003c/p\u003e\u003ccode\u003e    #0 _nx_mdns_name_string_encode  addons/mdns/nxd_mdns.c:13096\u003c/code\u003e\u003cbr\u003e\u003ccode\u003e    #1 _nx_mdns_packet_rr_add       addons/mdns/nxd_mdns.c:8911\u003c/code\u003e\u003cbr\u003e\u003cp\u003e0x611000000124 is 0 bytes to the right of 228-byte region\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eThe overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a\u003c/p\u003e\u003cp\u003enormal pool that lands in the next packet in the same pool rather than in a redzone, so the visible\u003c/p\u003e\u003cp\u003eeffect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.\u003c/p\u003e\u003cp\u003eCompare the slot size against the stored string length before declaring a match, or keep the\u003c/p\u003e\u003cp\u003estring length in the slot header and return it to the caller so the encoder and the bound check\u003c/p\u003e\u003cp\u003eagree.\u003c/p\u003e"
                }
              ],
              "value": "Any host on the LAN can send two mDNS records and make the responder write past the end of its\n\n\n\ntransmit packet.\n\n\n\nThe string table stores each name in a slot rounded up to a multiple of four:\n\n\n\n```c\n\n\n\n/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */\n\n\n\nmemory_len = ((memory_len \u0026 0xFFFFFFFC) + 8) \u0026 0xFFFFFFFF;\n\n\n\n...\n\n\n\nlen = *((USHORT*)(p - 2));           /* slot size, not string length */\n\n\n\nif ((len == memory_len) \u0026\u0026 ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)\n\n\n\n```\n\n\n\nThe lookup that decides whether an incoming name is already stored compares the rounded slot size,\n\n\n\nso names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered\n\n\n\nwith the pointer to the first, and the record then carries a string up to three bytes longer than\n\n\n\nthe length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only\n\n\n\nbound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.\n\n\n\nTwo PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names\n\n\n\nwhose lengths fall in the same bucket:\n\n\n\n```\n\n\n\n==87491==ERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nWRITE of size 1 at 0x611000000124 thread T5\n\n    #0 _nx_mdns_name_string_encode  addons/mdns/nxd_mdns.c:13096\n    #1 _nx_mdns_packet_rr_add       addons/mdns/nxd_mdns.c:8911\n\n\n0x611000000124 is 0 bytes to the right of 228-byte region\n\n\n\n```\n\n\n\nThe overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a\n\n\n\nnormal pool that lands in the next packet in the same pool rather than in a redzone, so the visible\n\n\n\neffect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.\n\n\n\nCompare the slot size against the stored string length before declaring a match, or keep the\n\n\n\nstring length in the slot header and return it to the caller so the encoder and the bound check\n\n\n\nagree."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "ADJACENT",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "exploitMaturity": "NOT_DEFINED",
                "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:N/VI:L/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-787",
                  "description": "CWE-787 Out-of-bounds Write",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-29T17:42:35.719Z",
            "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
            "shortName": "eclipse"
          },
          "references": [
            {
              "url": "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-2gf7-5224-5vrj"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "mDNS string-cache lookup matches on slot size, so a peer name aliases a shorter one and the response encoder writes past the packet",
          "x_generator": {
            "engine": "Vulnogram 1.0.5"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "assignerShortName": "eclipse",
        "cveId": "CVE-2026-102715",
        "datePublished": "2026-09-29T17:42:35.719Z",
        "dateReserved": "2026-09-29T16:15:11.235Z",
        "dateUpdated": "2026-09-29T18:42:21.812Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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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.


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