CVE-2026-10636
Use-after-free in Zephyr IPv4 IGMP send path (`igmp_send`)
Description
In Zephyr's 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's last reference may already have been released by the L2 driver or by the network stack's 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.
INFO
Published Date :
June 16, 2026, 3:16 p.m.
Last Modified :
Oct. 25, 2026, 11:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-10636
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | LOW | e2e69745-5e70-4e92-8431-deb5529a81ad | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Apply the patch to cache the interface pointer before sending.
- Update the affected IPv6 MLD path with the same fix.
- Test the corrected implementation thoroughly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-10636.
| URL | Resource |
|---|---|
| https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 | Patch |
| https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9 | Exploit Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-10636 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-10636
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-10636 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-10636 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: zephyr de zephyrproject, Description: En la implementación de IGMP IPv4 de Zephyr, igmp_send() en subsys/net/ip/igmp.c leía la interfaz de red del paquete a través de net_pkt_iface(pkt) después de que el paquete había sido entregado a net_send_data(). En la ruta de envío exitoso, la última referencia del paquete ya podría haber sido liberada por el controlador L2 o por el manejo TX de la pila de red (sincrónicamente en la configuración predeterminada de transmisión inmediata NET_TC_TX_COUNT=0), devolviendo el bloque slab net_pkt a su lista de libres. La subsiguiente net_pkt_iface(pkt) desreferencia el paquete liberado, una lectura de uso después de liberación; con CONFIG_NET_STATISTICS_PER_INTERFACE, el puntero de interfaz colgante resultante es desreferenciado aún más para una escritura de contador de estadísticas. La ruta de envío de IGMP es alcanzable sin autenticación desde consultas de membresía IGMP IPv4 entrantes dirigidas a 224.0.0.1 (net_ipv4_igmp_input - send_igmp_report/send_igmp_v3_report - igmp_send), así como desde operaciones locales de unión/salida/reunión de multidifusión. El impacto realista es un comportamiento indefinido y una potencial denegación de servicio (fallo esporádico o corrupción de estadísticas); una escritura controlable requiere la ruta TX asíncrona más una reutilización concurrente del slab. La falla fue introducida con el soporte de IGMPv2 y afecta a las versiones desde la v2.6.0 hasta la v4.4.0. La solución almacena en caché el puntero de interfaz antes de enviar. Tenga en cuenta que la ruta análoga de MLD IPv6 (mld_send en subsys/net/ip/ipv6_mld.c) conserva el mismo patrón sin corregir. -
CVE Modified by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/10xxx/CVE-2026-10636.json">CVE-2026-10636</a> Added Reference https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 Added Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9 Removed Reference https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 Removed Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9 Removed Reference Type https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 Types: Patch Removed Reference Type https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9 Types: Exploit, Patch, Vendor Advisory -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'zephyrproject', 'product': 'zephyr', 'versions': [{'status': 'affected', 'version': '2.6.0', 'lessThan': '4.5.0', 'versionType': 'semver'}], 'packageName': 'zephyr', 'collectionURL': 'https://github.com/zephyrproject-rtos/zephyr', 'defaultStatus': 'unaffected'}] [{'vendor': 'zephyrproject', 'product': 'zephyr', 'versions': [{'status': 'affected', 'version': '2.6.0', 'lessThan': '4.5.0', 'versionType': 'semver'}], 'packageName': 'zephyr', 'programFiles': ['subsys/net/ip/igmp.c'], 'collectionURL': 'https://github.com/zephyrproject-rtos/zephyr', 'defaultStatus': 'unaffected'}] Changed Description In Zephyr's 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's last reference may already have been released by the L2 driver or by the network stack's 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. In Zephyr's 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's last reference may already have been released by the L2 driver or by the network stack's 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. -
Initial Analysis by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Added CPE Configuration OR *cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:* versions from (including) 2.6.0 up to (excluding) 4.5.0 Added Reference Type Zephyr Project: https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 Types: Patch Added Reference Type Zephyr Project: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9 Types: Exploit, Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-10636', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-16T15:30:53.213579Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'zephyrproject', 'product': 'zephyr', 'versions': [{'status': 'affected', 'version': '2.6.0', 'lessThan': '4.5.0', 'versionType': 'semver'}], 'packageName': 'zephyr', 'collectionURL': 'https://github.com/zephyrproject-rtos/zephyr', 'defaultStatus': 'unaffected'}] -
New CVE Received by [email protected]
Jun. 16, 2026
Action Type Old Value New Value Added Description In Zephyr's 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's last reference may already have been released by the L2 driver or by the network stack's 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-416 Added Reference https://github.com/zephyrproject-rtos/zephyr/commit/0223e5e3ec5ebc51e8d0328fc3e604fa43552f54 Added Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj6q-975v-65c9