CVE-2026-98350: wifi: brcmfmac: cyw: pass PMKID to firmware if present
In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmfmac: cyw: pass PMKID to firmware if present
Zero out authstatus on initialization. Otherwise, garbage will leak from the stack to the firmware (when ssid is less than 32 bytes and/or when params->pmkid is set). Then, pass the params->pmkid to the firmware (without it, the firmware caches a garbage PMKID on successful authentication and denies a subsequent association request that includes the PMKID).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
In the brcmfmac CYW authentication path, zero out auth_status during initialization and when params->pmkid is set, and pass params->pmkid to the firmware when present to prevent caching or leaking a garbage PMKID.