CWE-416

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          "value": "In Zephyr\u0027s IPv4 IGMP implementation, igmp_send() in subsys/net/ip/igmp.c read the network interface back out of the packet via net_pkt_iface(pkt) after the packet had been handed to net_send_data(). On the successful-send path the packet\u0027s last reference may already have been released by the L2 driver or by the network stack\u0027s TX handling (synchronously in the default NET_TC_TX_COUNT=0 immediate-transmit configuration), returning the net_pkt slab block to its free list. The subsequent net_pkt_iface(pkt) dereferences the freed packet, a use-after-free read; with CONFIG_NET_STATISTICS_PER_INTERFACE the resulting dangling interface pointer is further dereferenced for a statistics-counter write. The IGMP send path is reachable without authentication from inbound IPv4 IGMP membership queries addressed to 224.0.0.1 (net_ipv4_igmp_input - send_igmp_report/send_igmp_v3_report - igmp_send), as well as from local multicast join/leave/rejoin operations. Realistic impact is undefined behavior and potential denial of service (sporadic crash or stats corruption); a controllable write requires the asynchronous TX path plus a concurrent slab reuse. The flaw was introduced with IGMPv2 support and affects releases from v2.6.0 through v4.4.0. The fix caches the interface pointer before sending. Note the analogous IPv6 MLD path (mld_send in subsys/net/ip/ipv6_mld.c) retains the same unfixed pattern."
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          "value": "subsys/net/ip/icmpv6.c reads the network interface from a net_pkt after that packet has been handed to net_try_send_data(). In icmpv6_handle_echo_request() and net_icmpv6_send_error(), the post-send statistics update calls net_pkt_iface(reply)/net_pkt_iface(pkt) on the just-sent packet. The send path (net_try_send_data - net_if_tx) unreferences and may free the packet back to its memory slab before returning \u2014 synchronously in the RX thread when no TX queue is configured (CONFIG_NET_TC_TX_COUNT == 0), and asynchronously the driver/L2 may already have freed it otherwise. net_pkt_iface() therefore dereferences a freed (and possibly reused) net_pkt; with CONFIG_NET_STATISTICS_PER_INTERFACE the stale iface pointer is further dereferenced and written through (iface-stats.icmp.sent++), turning the use-after-free read into a write through an attacker-influenceable pointer. The core stack already documents this hazard in net_core.c (\"do not use pkt after that call\") and caches iface before sending; the ICMPv6 callers did not. An unauthenticated remote attacker triggers the flaw simply by sending an ICMPv6 Echo Request (ping) or an IPv6 packet that elicits an ICMPv6 error (unknown next header, fragment reassembly timeout, destination unreachable), leading to denial of service via crash and potential memory corruption. Affected: Zephyr networking with CONFIG_NET_NATIVE_IPV6, roughly v4.2.0 through v4.4.0. The fix caches the interface pointer before sending and uses it for all statistics updates; the sibling commit 86e21665d46 fixes the identical bug in ICMPv4."
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            "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR",
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          }
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          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-119",
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      ],
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        "shortName": "VulDB"
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        {
          "name": "VDB-368016 | EIPStackGroup OpENer SendRRData cipmessagerouter.c CreateMessageRouterRequestStructure use after free",
          "tags": [
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            "technical-description"
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        },
        {
          "name": "VDB-368016 | CTI Indicators (IOB, IOC, IOA)",
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          ],
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          "tags": [
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        },
        {
          "name": "Submit #830921 | Linux OpENer (Open EtherNet/IP Stack) lastet  Use After Free",
          "tags": [
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          ],
          "url": "https://vuldb.com/submit/830921"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/EIPStackGroup/OpENer/issues/566"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/user-attachments/files/27100961/poc.zip"
        },
        {
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      ],
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        {
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        {
          "lang": "en",
          "time": "2026-06-02T19:47:23.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "EIPStackGroup OpENer SendRRData cipmessagerouter.c CreateMessageRouterRequestStructure use after free"
    }
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    "dateReserved": "2026-06-02T17:42:17.882Z",
    "dateUpdated": "2026-06-03T12:41:17.854Z",
    "state": "PUBLISHED"
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}