CVE-2026-98350 wifi: brcmfmac: cyw: pass PMKID to firmware if present
An attacker within Wi-Fi range can read uninitialized kernel stack memory leaked to firmware due to improper initialization in the brcmfmac driver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98350?
CVE-2026-98350 is a vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmfmac: cyw: pass PMKID to firmware if present
Zero out auth_status 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).
Which versions are affected by CVE-2026-98350?
How do I fix CVE-2026-98350?
Apply the vendor's patch.
Is CVE-2026-98350 being exploited?
There is no known exploitation of CVE-2026-98350 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98350, DEBIAN-CVE-2026-98350, GHSA-c6xm-v6x8-64wh, UBUNTU-CVE-2026-98350.