Out-of-bounds array index in Linux kernel brcmfmac IF event handling
CVE-2026-43110 is a Linux kernel vulnerability in the Broadcom brcmfmac Wi-Fi driver. In brcmf_fweh_handle_if_event(), the driver validated the firmware-provided interface index before accessing drvr->iflist[], but still used the raw bsscfgidx field as an array index without performing a corresponding bounds check. A malicious or malformed IF event containing an out-of-range bsscfg index could therefore cause the kernel to index drvr->iflist[] with an invalid value. The issue was resolved by rejecting IF events whose bsscfg index does not fit within drvr->iflist[] before indexing the interface array.
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