If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver, which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger a heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (CVE-2019-9503), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out.
blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html#cve-2019-9500-heap-buffer-overflow-in-brcmf-wowl-nd-results
bugzilla.redhat.com/show_bug.cgi?id=1701224
kb.cert.org/vuls/id/166939/
nvd.nist.gov/vuln/detail/CVE-2019-9500
www.bleepingcomputer.com/news/security/broadcom-wifi-driver-flaws-expose-computers-phones-iot-to-rce-attacks/
www.cve.org/CVERecord?id=CVE-2019-9500