{"metadata": {"vulnerability": "CVE-2026-19673", "count": 10, "kinds": {"milestone": 3, "sighting": 1, "kev": 0, "other": 6}}, "data": [{"timestamp": "2026-08-12T21:27:43.897Z", "date_only": false, "value": "2026-08-12T21:27:43.897Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-14T16:45:57.967Z", "date_only": false, "value": "2026-10-14T16:45:57.967Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-14T16:45:57.967Z", "date_only": false, "value": "2026-10-14T16:45:57.967Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / zephyr", "record": "CVE-2026-19673", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-14T17:18:26.800Z", "date_only": false, "value": "2026-10-14T17:18:26.800", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19673", "record": "FKIE_CVE-2026-19673", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-14T22:14:58.891Z", "date_only": false, "value": "2026-10-14T22:14:58.891159Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117441567018129704", "record": "CVE-2026-19673", "field": "creation_timestamp", "uuid": "d8963e0b-f1cf-4350-b320-bd7361a02094", "content": "CVE-2026-19673 Out-of-bounds read and net_buf length underflow in Zephyr Ethernet L2 when parsing a truncated VLAN header ethernet_recv() in subsys/net/l2/ethernet/ethernet.c validates only that the first net_buf of a received frame holds a plain 14-byte struct net_eth_hdr. When the ethertype is 0x8100 and VLAN is enabled on the interface, the same buffer is reinterpreted as the 18-byte struct net_eth_vlan_hdr without re-checking the length: the VLAN TCI and the inner ethertype are read from offsets 14..17, past pkt->buffer->len, and hdr_len is raised to 18 so the subsequent net_buf_pull() removes more bytes than the buffer holds.\nA single unauthenticated frame of 14 to 17 bytes carrying the VLAN ethertype triggers this. No knowledge of the node's VLAN configuration is needed: net_eth_get_vlan_iface() returns the base interface for the priority tag 0, and a broadcast destination address satisfies the \"frame is for me\" test, so a 16-byte broadcast frame with ethertype 0x8100 and TCI 0x0000 reaches the pull. Nothing in the receive path enforces the 60-byte Ethernet minimum \u2014 the USB CDC ECM and CDC NCM gadget classes in particular hand host-supplied frames of any non-zero length straight to net_recv_data().\nWith assertions enabled, net_buf_simple_pull() asserts and the node panics. In a production build (assertions and CONFIG_NET_BUF_HARDENING off) the uint16_t buffer length underflows to 65534 and buf->data is advanced past the end of the fragment's storage, so every later parser reads far outside the buffer and any net_buf_add() on that fragment computes tailroom from the underflowed length. The result is a reliable remote denial of service and out-of-bounds access with information-disclosure and corruption potential.\nOnly configurations built with CONFIG_NET_VLAN=y that have a VLAN enabled on the receiving Ethernet interface, and whose MAC does not strip VLAN tags in hardware (ETHERNET_HW_VLAN_TAG_STRIP), are affected. The fix rejects the frame before the tag is read, so hdr_len is thereafter either 14 or 18 with both sizes validated against pkt->buffer->len.\nhttps://www.cve.org/CVERecord?id=CVE-2026-19673https://github.com/zephyrproject-rtos/zephyr/commit/fd3c6fedf6b639977a80e52b680b15672c31f3efhttps://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-79rf-rwff-f4vg#zephyrproject #zephyr#CVE_2026_19673#bot", "url": "https://infosec.exchange/users/cve/statuses/117441567018129704"}, {"timestamp": "2026-10-16T15:25:19.143Z", "date_only": false, "value": "2026-10-16T15:25:19.143054Z", "kind": "other", "label": "Recorded", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-19673", "field": "containers.adp.0.metrics.0.other.content.timestamp"}, {"timestamp": "2026-10-16T15:25:19.143Z", "date_only": false, "value": "2026-10-16T15:25:19.143054Z", "kind": "other", "label": "Recorded", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19673", "record": "FKIE_CVE-2026-19673", "field": "metrics.ssvcV203.0.ssvcData.timestamp"}, {"timestamp": "2026-10-16T15:31:46.383Z", "date_only": false, "value": "2026-10-16T15:31:46.383Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-10-16T15:31:46.383Z", "date_only": false, "value": "2026-10-16T15:31:46.383Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / CISA-ADP", "record": "CVE-2026-19673", "field": "containers.adp.0.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-16T16:17:05.187Z", "date_only": false, "value": "2026-10-16T16:17:05.187", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-19673", "record": "FKIE_CVE-2026-19673", "field": "lastModified"}], "metrics": {"as_of": "2026-10-29T02:50:33.796Z", "anchors": {"origin": {"timestamp": "2026-10-14T16:45:57.967Z", "date_only": false, "value": "2026-10-14T16:45:57.967Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "discovery": null, "report": null, "acknowledgement": null, "disclosure": {"timestamp": "2026-10-14T16:45:57.967Z", "date_only": false, "value": "2026-10-14T16:45:57.967Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "exploit_publication": null, "exploitation": null, "patch": null}, "vendor_response_time": {"available": false, "missing": ["start", "end"]}, "time_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit_publication": {"available": false, "missing": ["end"]}, "time_to_patch": {"available": false, "missing": ["start", "end"]}, "total_time_to_patch": {"available": false, "missing": ["start", "end"]}, "disclosure_to_patch": {"available": false, "missing": ["end"]}, "time_unpatched": {"available": true, "seconds": 1245875.829956, "hours": 346.07661943222223, "days": 14.419859143009258, "min_seconds": 1245875.829956, "max_seconds": 1245875.829956, "approximate": false, "ongoing": true, "order_known": true, "batch_listing": false, "end_before_start": false, "start": {"timestamp": "2026-10-14T16:45:57.967Z", "date_only": false, "value": "2026-10-14T16:45:57.967Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-19673", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "end": {"timestamp": "2026-10-29T02:50:33.796Z", "date_only": false, "label": "As of", "source": "Calculation clock"}}, "exploitation_to_patch": {"available": false, "missing": ["start"]}, "exploit_publication_to_patch": {"available": false, "missing": ["start"]}}}