CVE-2026-14697— IPv6邻居请求包泄露导致服务拒绝
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。
中的 函数用于为邻居请求（Neighbor Solicitation, NS）分配一个发送用的网络数据包（net_pkt）。当该函数在存在未解析邻居且有数据报等待发送时被调用，且该邻居的 非空（即已有一个未决的 NS），该函数会将数据报追加到队列中并提前返回，但从未通过 发送该 NS，也未通过 释放它。新分配的 NS 数据包及其附带的 TX 缓冲区仅由局部变量持有，从而导致永久性内存泄漏，永远不会归还到 / 池中。 该泄漏分支位于常规的 IPv6 发送路径上： （由 调用）对于下一跳尚未进入邻居缓存的任何出站或转发
可能的 ATT&CK 技术 1 AI
T1499.004 · Application or System Exploitation
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一、 漏洞 CVE-2026-14697 基础信息
漏洞信息
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Vulnerability Title
IPv6 Neighbor Solicitation packet leak causes TX pool exhaustion denial of service
来源: CVE Program / CVE List V5
Vulnerability Description
net_ipv6_send_ns() in subsys/net/ip/ipv6_nbr.c allocates a transmit net_pkt for a Neighbor Solicitation. When it is called with a data packet pending on an unresolved neighbor and that neighbor's pending_queue is already non-empty (an NS is already outstanding), the function appends the data packet and returns early without ever sending the NS via net_send_data() or releasing it with net_pkt_unref(). The freshly allocated NS net_pkt and its attached TX buffers are held only by a local variable and are leaked permanently, never returning to CONFIG_NET_PKT_TX_COUNT / CONFIG_NET_BUF_TX_COUNT.
The leaking branch sits on the normal IPv6 transmit path: net_ipv6_prepare_for_send() (called from net_if.c) invokes net_ipv6_send_ns() for any outbound or forwarded IPv6 packet whose next hop is not yet in the neighbor cache. An on-link (adjacent) attacker can drive it deterministically by sending a burst of request packets (for example ICMPv6 echo requests or UDP datagrams) that all spoof a single non-existent on-link source address: the node generates a reply to each, the first reply queues an NS, and every subsequent reply during the roughly three-second INCOMPLETE resolution window takes the leaking branch and loses one TX packet. Router-configured nodes forwarding attacker traffic toward a non-existent on-link host leak identically.
Because the leaked packets are never reclaimed and CONFIG_NET_PKT_TX_COUNT defaults to only 4 (14 for Ethernet), a brief low-rate burst exhausts the TX pool. Once exhausted the node can no longer allocate any transmit packet and cannot send TCP/UDP, ARP/ND, or any reply at all, producing a complete and persistent network denial of service that does not self-heal until reboot. The fix releases the unsent NS packet with net_pkt_unref(pkt) before the early return.
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
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 4.3.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-14697 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-14697 其他参考 (2)
同批安全公告 · zephyrproject · 2026-08-31 · 共 5 条
| CVE-2026-14696 | 6.5 MEDIUM | Linux Kernel 以太网桥 RX 包泄漏致服务拒绝漏洞 |
| CVE-2026-14366 | 6.4 MEDIUM | SiWx91x WiFi驱动TX包重复解引用/释放后使用漏洞 |
| CVE-2026-14368 | 5.4 MEDIUM | Zephyr LwM2M 解析器 NUL 写入越界漏洞 |
| CVE-2026-14367 | 3.1 LOW | I3C IBI 工作节点链表数据竞争漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-14697
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