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CVE-2026-14696— Ethernet bridge RX packet leak enables denial of service via RX buffer-pool exhaustion

Quick assessment

Affected
zephyrproject zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.5 · Medium EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.4.0< 4.4.2 affected
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I. Basic Information for CVE-2026-14696

Vulnerability Information
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Vulnerability Title
Ethernet bridge RX packet leak enables denial of service via RX buffer-pool exhaustion
Source: 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.
Source: 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
Source: 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)
Source: CVE Program / CVE List V5
Vulnerability Title
zephyrproject Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 4.4.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-14696

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III. Intelligence Information for CVE-2026-14696

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Patches & Fixes for CVE-2026-14696 (1)

Vendor Advisories for CVE-2026-14696 (1)

Same Patch Batch · zephyrproject · 2026-08-31 · 5 CVEs total

CVE-2026-14697 6.5 MEDIUM IPv6 Neighbor Solicitation packet leak causes TX pool exhaustion denial of service
CVE-2026-14366 6.4 MEDIUM SiWx91x WiFi driver double-unref / use-after-free of caller-owned TX net_pkt
CVE-2026-14368 5.4 MEDIUM Off-by-one out-of-bounds NUL write in Zephyr LwM2M JSON string parser
CVE-2026-14367 3.1 LOW I3C IBI work-node free-list data race between ISR and workqueue thread

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-401