CVE-2026-14366
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
The Silicon Labs SiWx917 WiFi driver's siwx91x_send() function 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. Before the fix, the driver called net_pkt_unref(pkt) on the caller-owned packet, prematurely returning it to the shared packet pool.
Risk Assessment
The vulnerability leads to use-after-free and double-free conditions in the network packet pool shared by both receive and transmit paths. This can cause transmit hangs, system crashes, and memory corruption of kernel networking buffers, impacting service availability.
Recommendation
Apply the vendor-provided fix that removes the erroneous net_pkt_unref(pkt) call from siwx91x_send(). Update the driver to the patched version and test the WiFi interface in your production environment.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS