CVE-2026-14696— zephyrproject Zephyr 资源管理错误漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 4.4.0版本存在资源管理错误漏洞，该漏洞源于eth_bridge_handle_locally()函数未正确消耗数据包却返回NET_OK，导致数据包未被释放并发生内存泄漏，攻击者可通过发送任意EtherType的广播或组播帧耗尽接收缓冲池，造成拒绝服务。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 4.4.0< 4.4.2 |
affected |
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一、 漏洞 CVE-2026-14696 基础信息
漏洞信息
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Vulnerability Title
Ethernet bridge RX packet leak enables denial of service via RX buffer-pool exhaustion
来源: CVE Program / CVE List V5
Vulnerability Description
When Ethernet bridging is enabled (CONFIG_NET_ETHERNET_BRIDGE), eth_bridge_input_process() in subsys/net/l2/ethernet/bridge/bridge_input.c decides how each frame received on a bridge member interface is handled. For frames that must also be delivered to the local stack, the code called eth_bridge_handle_locally() and returned NET_OK. That helper does not consume the packet — it only calls bridge_iface_recv() (via virtual_recv()), which returns NET_CONTINUE without taking ownership of pkt.
The NET_OK verdict then propagates through ethernet_recv() up to processing_data() in subsys/net/ip/net_core.c, where NET_OK is interpreted as "the packet was consumed, do not free it." Because no consumer actually took ownership, the RX net_pkt is never returned to the pool and is leaked. The concretely reproducible leak occurs for frames whose EtherType has no registered L3 handler when CONFIG_NET_ETHERNET_FORWARD_UNRECOGNISED_ETHERTYPE is set (default y when CONFIG_NET_SOCKETS_PACKET is enabled): the fall-through L3 dispatch does not overwrite the NET_OK verdict, so ethernet_recv() returns NET_OK and the buffer is never released.
Any device on a bridged L2 segment can emit broadcast/multicast frames carrying an arbitrary EtherType with no authentication. Each such frame permanently consumes one buffer from the finite RX pool (CONFIG_NET_PKT_RX_COUNT), so a brief broadcast flood exhausts the pool and the device can no longer receive traffic until it is rebooted — a persistent denial of service. There is no confidentiality or integrity impact.
The fix makes eth_bridge_handle_locally() propagate the real net_verdict and return NET_CONTINUE for locally-kept frames, writing the bridge interface back through a new dst_iface out-parameter so the packet follows the normal receive path and is unreferenced exactly once.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
来源: CVE Program / CVE List V5
Vulnerability Title
zephyrproject Zephyr 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 4.4.0版本存在资源管理错误漏洞，该漏洞源于eth_bridge_handle_locally()函数未正确消耗数据包却返回NET_OK，导致数据包未被释放并发生内存泄漏，攻击者可通过发送任意EtherType的广播或组播帧耗尽接收缓冲池，造成拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 4.4.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-14696 的公开POC
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|---|
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CVE-2026-14696 补丁与修复 (1)
CVE-2026-14696 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-08-31 · 共 5 条
| CVE-2026-14697 | 6.5 MEDIUM | zephyrproject Zephyr 资源管理错误漏洞 |
| CVE-2026-14366 | 6.4 MEDIUM | zephyrproject Zephyr 资源管理错误漏洞 |
| CVE-2026-14368 | 5.4 MEDIUM | zephyrproject Zephyr 数字错误漏洞 |
| CVE-2026-14367 | 3.1 LOW | zephyrproject Zephyr 竞争条件问题漏洞 |