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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.

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 4.1.0版本至4.4.2之前版本存在资源管理错误漏洞，该漏洞源于SiWx917 WiFi驱动程序的发送回调函数siwx91x_send()释放了不属于自己的网络数据包，导致释放后重用和双重释放，可能造成传输挂起、崩溃及内核网络缓冲池内存损坏。

CVSS 6.4 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.1.0< 4.4.2 affected
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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
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 4.1.0版本至4.4.2之前版本存在资源管理错误漏洞，该漏洞源于SiWx917 WiFi驱动程序的发送回调函数siwx91x_send()释放了不属于自己的网络数据包，导致释放后重用和双重释放，可能造成传输挂起、崩溃及内核网络缓冲池内存损坏。
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 4.1.0 ~ 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)

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

CVE-2026-14696 6.5 MEDIUM Ethernet bridge RX packet leak enables denial of service via RX buffer-pool exhaustion
CVE-2026-14697 6.5 MEDIUM IPv6 Neighbor Solicitation packet leak causes TX pool exhaustion denial of service
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-416