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CVE-2026-14366— SiWx91x WiFi driver double-unref / use-after-free of caller-owned TX net_pkt

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.

以下是该漏洞描述的中文翻译： Silicon Labs SiWx917 的 WiFi 驱动中，位于 中的发送回调函数 释放了一个它并不拥有的网络数据包。 在 Zephyr 的发送（TX）路径中， 的所有权属于 L2/网络栈；驱动仅借用该包，将帧字节复制到本地的 中。在修复之前， 在发送完成后，额外对由调用者拥有的数据包调用了 ，从而提前降低了其引用计数，并过早地将该包返回到共享数据包池中。该代码路径默认通过 配置启用。 调用方 （位于 ）在驱动返回后继续使用该数据包：它会读取 ，更新发送（TX）统计信息，然后执行自

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-14366

Vulnerability Information
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Vulnerability Title
SiWx91x WiFi driver double-unref / use-after-free of caller-owned TX net_pkt
Source: CVE Program / CVE List V5
Vulnerability Description
The Silicon Labs SiWx917 WiFi driver's transmit callback siwx91x_send() in drivers/wifi/siwx91x/siwx91x_wifi.c frees a network packet it does not own. In the Zephyr TX path the net_pkt is owned by the L2/networking stack; the driver only borrows it to copy the frame bytes into a local net_buf. Before the fix, after transmitting, siwx91x_send() additionally called net_pkt_unref(pkt) on the caller-owned packet, dropping its last reference and returning it to the shared packet pool prematurely. This code path is compiled in by default (CONFIG_WIFI_SILABS_SIWX91X_NET_STACK_NATIVE). The caller, ethernet_send() in subsys/net/l2/ethernet/ethernet.c, keeps using the packet after the driver returns: it reads net_pkt_get_len(pkt), updates TX statistics, and then performs its own net_pkt_unref(pkt). Because the driver already released the packet, these are use-after-free reads followed by a second unref (a double free). When concurrent network activity recycles the freed slab slot between the two unrefs, the trailing unref decrements a different, live packet's reference count and frees it, corrupting the net_pkt pool shared by both the receive and transmit paths. The defect is exercised by ordinary transmission over the native-stack SiWx917 WiFi interface, and an adjacent attacker on the same WiFi network can induce transmissions (for example ARP or ICMP echo replies, or TCP handshakes) to drive the path. The primary observable impact is loss of availability (transmit hangs and crashes from pool corruption), with race-dependent memory corruption of the kernel networking buffer pool. The fix removes the erroneous net_pkt_unref(pkt) from siwx91x_send(); the driver's receive-path unref, which correctly frees a packet the driver itself allocated, is unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 4.1.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-14366

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III. Intelligence Information for CVE-2026-14366

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Patches & Fixes for CVE-2026-14366 (1)

Vendor Advisories for CVE-2026-14366 (1)

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-416

V. Comments for CVE-2026-14366

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