cve 2025 40321

About this tag
CVE-2025-40321 is a security vulnerability in the Broadcom Linux wireless driver (brcmfmac) that causes a NULL-pointer crash when the driver sends Wi-Fi Action Frames in standalone AP mode (hostapd-only). An incoming ANQP or Action frame can trigger the flaw, leading to an immediate kernel oops and driver crash. The upstream fix changes how the driver selects the virtual interface for actframe IOVARs and moves initialization of a completion object to prevent dereferencing an uninitialized pointer. This tag covers discussions about the vulnerability, its impact on Linux systems using Broadcom wireless hardware, and the upstream patch that resolves the issue.

  1. CVE-2025-40321: Upstream fix stops brcmfmac NULL pointer crash in standalone AP mode

    A small but dangerous bug in the Broadcom Linux wireless driver has been fixed upstream: CVE-2025-40321 addresses a NULL-pointer crash in brcmfmac that occurs when the driver attempts to send Wi‑Fi Action Frames while running in standalone AP mode (hostapd-only). The flaw can be triggered by an...
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