CVE-2026-10665
Full vulnerability record from the local CVENow database.
Description
In Zephyr's WireGuard subsystem (subsys/net/lib/wireguard), wg_process_data_message() in wg_crypto.c linearizes an inbound transport-data payload into a fixed pool buffer of CONFIG_WIREGUARD_BUF_LEN bytes before decryption. The call net_buf_linearize(buf->data, data_len, pkt->buffer, ..., data_len) passed the attacker-derived data_len as both the destination capacity and the copy length, defeating the function's internal len = min(len, dst_len) bound. data_len is derived from the received UDP datagram length and is only lower-bounded by wg_ctrl_recv() (no upper bound). When data_len exceeds CONFIG_WIREGUARD_BUF_LEN — e.g. when the buffer length is lowered below the link MTU, on links with MTU above the buffer size, or via reassembled IPv4/IPv6 fragments that exceed it — the underlying memcpy writes past the end of the pool buffer, an out-of-bounds write (CWE-787). The overflow occurs before the Poly1305 authentication check, so it requires only a valid receiver session index rather than a valid authenticator, and is reachable by a malicious or compromised peer (or an on-path attacker driving an established session) over the network, yielding remote memory corruption and at minimum a reliable denial of service. The defect was present in the WireGuard implementation shipped in Zephyr 4.4.0. The fix adds an explicit data_len > CONFIG_WIREGUARD_BUF_LEN rejection and corrects the linearize call to pass net_buf_max_len(buf) as the destination capacity.
View original CVE JSON
{
"id": "CVE-2026-10665",
"sourceIdentifier": "[email protected]",
"published": "2026-07-12T17:16:24.433",
"lastModified": "2026-10-24T22:10:00.210",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In Zephyr's WireGuard subsystem (subsys/net/lib/wireguard), wg_process_data_message() in wg_crypto.c linearizes an inbound transport-data payload into a fixed pool buffer of CONFIG_WIREGUARD_BUF_LEN bytes before decryption. The call net_buf_linearize(buf->data, data_len, pkt->buffer, ..., data_len) passed the attacker-derived data_len as both the destination capacity and the copy length, defeating the function's internal len = min(len, dst_len) bound. data_len is derived from the received UDP datagram length and is only lower-bounded by wg_ctrl_recv() (no upper bound). When data_len exceeds CONFIG_WIREGUARD_BUF_LEN — e.g. when the buffer length is lowered below the link MTU, on links with MTU above the buffer size, or via reassembled IPv4/IPv6 fragments that exceed it — the underlying memcpy writes past the end of the pool buffer, an out-of-bounds write (CWE-787). The overflow occurs before the Poly1305 authentication check, so it requires only a valid receiver session index rather than a valid authenticator, and is reachable by a malicious or compromised peer (or an on-path attacker driving an established session) over the network, yielding remote memory corruption and at minimum a reliable denial of service. The defect was present in the WireGuard implementation shipped in Zephyr 4.4.0. The fix adds an explicit data_len > CONFIG_WIREGUARD_BUF_LEN rejection and corrects the linearize call to pass net_buf_max_len(buf) as the destination capacity."
},
{
"lang": "es",
"value": "En el subsistema WireGuard de Zephyr (subsys/net/lib/wireguard), wg_process_data_message() en wg_crypto.c linealiza una carga útil de datos de transporte entrante en un búfer de grupo fijo de CONFIG_WIREGUARD_BUF_LEN bytes antes del descifrado. La llamada net_buf_linearize(buf -> data, data_len, pkt -> buffer, ..., data_len) pasó el data_len derivado del atacante como la capacidad de destino y la longitud de copia, anulando el límite interno de la función len = min(len, dst_len). data_len se deriva de la longitud del datagrama UDP recibido y solo está limitado inferiormente por wg_ctrl_recv() (sin límite superior). Cuando data_len excede CONFIG_WIREGUARD_BUF_LEN - por ejemplo, cuando la longitud del búfer se reduce por debajo de la MTU del enlace, en enlaces con MTU superior al tamaño del búfer, o a través de fragmentos IPv4/IPv6 reensamblados que lo exceden - el memcpy subyacente escribe más allá del final del búfer de grupo, una escritura fuera de límites (CWE-787). El desbordamiento ocurre antes de la verificación de autenticación Poly1305, por lo que solo requiere un índice de sesión de receptor válido en lugar de un autenticador válido, y es alcanzable por un par malicioso o comprometido (o un atacante en la ruta que controla una sesión establecida) a través de la red, lo que produce corrupción de memoria remota y como mínimo una denegación de servicio confiable. El defecto estaba presente en la implementación de WireGuard distribuida en Zephyr 4.4.0. La solución añade un rechazo explícito de data_len > CONFIG_WIREGUARD_BUF_LEN y corrige la llamada de linealización para pasar net_buf_max_len(buf) como la capacidad de destino."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "zephyrproject",
"product": "zephyr",
"defaultStatus": "unaffected",
"collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
"packageName": "zephyr",
"programFiles": [
"subsys/net/lib/wireguard/wg_crypto.c"
],
"versions": [
{
"version": "4.4.0",
"lessThan": "4.4.2",
"versionType": "semver",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.2,
"impactScore": 5.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-07-13T15:48:45.958922Z",
"id": "CVE-2026-10665",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
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{
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],
"role": "CISA Coordinator",
"version": "2.0.3"
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
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"references": [
{
"url": "https://github.com/zephyrproject-rtos/zephyr/commit/6d8bb28dc9064e05e52b5a00b2998ecc663e38cb",
"source": "[email protected]",
"tags": [
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},
{
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3wqm-wgx2-9367",
"source": "[email protected]",
"tags": [
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{
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3wqm-wgx2-9367",
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