CVE-2026-10640

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-10640", "assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad", "state": "PUBLISHED", "assignerShortName": "zephyr", "dateReserved": "2026-06-02T15:11:40.707Z", "datePublished": "2026-06-16T13:28:24.493Z", "dateUpdated": "2026-11-04T04:58:11.315Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad", "shortName": "zephyr", "dateUpdated": "2026-11-04T04:58:11.315Z"}, "title": "Use-after-free reading `net_pkt` `iface` after send in IPv6 Neighbor Discovery (`ipv6_nbr.c`)", "descriptions": [{"lang": "en", "value": "Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_nbr.c) updated the per-interface ICMP-sent statistics by calling net_pkt_iface(pkt) after net_send_data(pkt) had already returned successfully. On the success path the network stack owns and releases the packet's reference (the L2/driver send unrefs it, e.g. ethernet_send -> net_pkt_unref), so for a freshly allocated packet with refcount 1 the net_pkt slab block can be freed before the statistics line runs (synchronously when no TX queue thread is configured, or via a concurrent TX thread otherwise).\n\nThe subsequent net_pkt_iface(pkt) reads pkt->iface from the freed slab block, and with CONFIG_NET_STATISTICS_PER_INTERFACE enabled that loaded pointer is dereferenced to increment iface->stats.icmp.sent, a use-after-free (CWE-416). If the slab block was reallocated in the meantime the read/increment targets unrelated or attacker-influenced memory, yielding corrupted statistics, a fault/crash (denial of service), or potential limited memory corruption.\n\nThe vulnerable Neighbor Advertisement path is reachable by any unauthenticated on-link node simply by sending ICMPv6 Neighbor Solicitations to a Zephyr node with native IPv6 enabled (handle_ns_input -> net_ipv6_send_na).\n\nAffected from v3.3.0 through v4.4.0; the fix uses the already-available iface argument instead of touching the sent packet. Configurations without per-interface statistics dereference only a global counter and are not affected by the memory-safety aspect."}], "affected": [{"vendor": "zephyrproject", "product": "zephyr", "collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "packageName": "zephyr", "defaultStatus": "unaffected", "programFiles": ["subsys/net/ip/ipv6_nbr.c"], "versions": [{"version": "3.3.0", "status": "affected", "versionType": "semver", "lessThan": "4.3.1"}, {"version": "4.4.0", "status": "affected", "versionType": "semver", "lessThan": "4.4.1"}]}], "references": [{"url": "https://github.com/zephyrproject-rtos/zephyr/commit/aaed8332a62b0490a2f3c2cbabe272f575068eaa", "name": "Fix commit", "tags": ["patch"]}, {"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-r74c-mr4m-7g9g", "name": "GHSA-r74c-mr4m-7g9g"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L", "baseScore": 4.2, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "use-after-free", "cweId": "CWE-416", "type": "CWE"}]}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-16T15:28:30.797017Z", "id": "CVE-2026-10640", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T15:28:39.137Z"}}]}}

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{"affected": [{"affectedData": [{"collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "defaultStatus": "unaffected", "packageName": "zephyr", "product": "zephyr", "programFiles": ["subsys/net/ip/ipv6_nbr.c"], "vendor": "zephyrproject", "versions": [{"lessThan": "4.3.1", "status": "affected", "version": "3.3.0", "versionType": "semver"}, {"lessThan": "4.4.1", "status": "affected", "version": "4.4.0", "versionType": "semver"}]}], "source": "vulnerabilities@zephyrproject.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*", "matchCriteriaId": "7032D8BD-EADE-46BD-861F-2397CC9081BB", "versionEndExcluding": "4.5.0", "versionStartIncluding": "3.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_nbr.c) updated the per-interface ICMP-sent statistics by calling net_pkt_iface(pkt) after net_send_data(pkt) had already returned successfully. On the success path the network stack owns and releases the packet's reference (the L2/driver send unrefs it, e.g. ethernet_send -> net_pkt_unref), so for a freshly allocated packet with refcount 1 the net_pkt slab block can be freed before the statistics line runs (synchronously when no TX queue thread is configured, or via a concurrent TX thread otherwise).\n\nThe subsequent net_pkt_iface(pkt) reads pkt->iface from the freed slab block, and with CONFIG_NET_STATISTICS_PER_INTERFACE enabled that loaded pointer is dereferenced to increment iface->stats.icmp.sent, a use-after-free (CWE-416). If the slab block was reallocated in the meantime the read/increment targets unrelated or attacker-influenced memory, yielding corrupted statistics, a fault/crash (denial of service), or potential limited memory corruption.\n\nThe vulnerable Neighbor Advertisement path is reachable by any unauthenticated on-link node simply by sending ICMPv6 Neighbor Solicitations to a Zephyr node with native IPv6 enabled (handle_ns_input -> net_ipv6_send_na).\n\nAffected from v3.3.0 through v4.4.0; the fix uses the already-available iface argument instead of touching the sent packet. Configurations without per-interface statistics dereference only a global counter and are not affected by the memory-safety aspect."}, {"lang": "es", "value": "Las rutas de env\u00edo de Neighbor Discovery IPv6 de Zephyr (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs en subsys/net/ip/ipv6_nbr.c) actualizaban las estad\u00edsticas de ICMP enviado por interfaz llamando a net_pkt_iface(pkt) despu\u00e9s de que net_send_data(pkt) ya hab\u00eda retornado exitosamente. En la ruta de \u00e9xito, la pila de red posee y libera la referencia del paquete (el env\u00edo del L2/controlador la desreferencia, p. ej., ethernet_send - net_pkt_unref), as\u00ed, para un paquete reci\u00e9n asignado con refcount 1, el bloque slab de net_pkt puede ser liberado antes de que se ejecute la l\u00ednea de estad\u00edsticas (sincr\u00f3nicamente cuando no hay un hilo de cola TX configurado, o a trav\u00e9s de un hilo TX concurrente de lo contrario).\n\nLa subsiguiente net_pkt_iface(pkt) lee pkt-iface del bloque slab liberado, y con CONFIG_NET_STATISTICS_PER_INTERFACE habilitado, ese puntero cargado es desreferenciado para incrementar iface-stats.icmp.sent, un uso despu\u00e9s de liberaci\u00f3n (CWE-416). Si el bloque slab fue reasignado mientras tanto, la lectura/incremento apunta a memoria no relacionada o influenciada por el atacante, resultando en estad\u00edsticas corruptas, una falla/ca\u00edda (denegaci\u00f3n de servicio), o potencial corrupci\u00f3n de memoria limitada.\n\nLa ruta vulnerable de Neighbor Advertisement es alcanzable por cualquier nodo en el enlace no autenticado simplemente enviando Solicitudes de Vecino ICMPv6 a un nodo Zephyr con IPv6 nativo habilitado (handle_ns_input - net_ipv6_send_na).\n\nAfectado desde v3.3.0 hasta v4.4.0; la correcci\u00f3n utiliza el argumento iface ya disponible en lugar de tocar el paquete enviado. Las configuraciones sin estad\u00edsticas por interfaz desreferencian solo un contador global y no se ven afectadas por el aspecto de seguridad de la memoria."}], "id": "CVE-2026-10640", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.5, "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10640", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T15:28:30.797017Z", "version": "2.0.3"}}]}, "published": "2026-06-16T15:16:34.317", "references": [{"source": "vulnerabilities@zephyrproject.org", "tags": ["Patch"], "url": "https://github.com/zephyrproject-rtos/zephyr/commit/aaed8332a62b0490a2f3c2cbabe272f575068eaa"}, {"source": "vulnerabilities@zephyrproject.org", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-r74c-mr4m-7g9g"}], "sourceIdentifier": "vulnerabilities@zephyrproject.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.3.0,4.5.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "zephyr", "source": "cna", "vendor": "zephyrproject"}, "product": "zephyr", "vendor": "zephyrproject"}], "created": "2026-06-16T16:30:16.702199+00:00", "updated": "2026-07-31T17:15:03.764591+00:00", "vendors": ["zephyrproject", "zephyrproject$PRODUCT$zephyr"]}