CVE-2026-99061 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that use the brcmfmac driver should care about this vulnerability. They should review and apply patches, update the Linux kernel, and monitor system logs for potential crashes or errors related to the brcmfmac driver. The vulnerability affects operators, platforms, vulnerability-management, and security teams that use the Linux kernel's brcmfmac driver

Why it matters

A race condition vulnerability in the Linux kernel's brcmfmac driver can cause a kernel crash when a P2P device is removed while the user space process that created it is still exiting. This vulnerability requires attention from Linux kernel developers, maintainers, and users of Linux-based systems that use the brcmfmac driver.

• Potential kernel crashes or instability
• Possible denial of service (DoS) attacks
• Need for patching and updating Linux kernel versions

Technical summary

The vulnerability is caused by a race condition between the wpa_supplicant and brcmf_detach() paths, leading to a double removal of the P2P device interface and a kernel crash. The affected product context is the Linux kernel's brcmfmac driver. The defensive impact is a potential kernel crash or instability. The source-grounded technical framing is based on the provided source corpus without unsupported root-cause or exploit claims. The vulnerability requires attention from Linux kernel developers and maintainers to fix the issue.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers to fix the vulnerability
• Ensure that the Linux kernel is updated to a version that includes the fix
• Monitor system logs for potential crashes or errors related to the brcmfmac driver
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by a race condition between the wpa_supplicant and brcmf_detach() paths, leading to a double removal of the P2P device interface and a kernel crash. The source grounding for this vulnerability is the Linux kernel's brcmfmac driver. The evidence limits are based on the provided source corpus. Defenders should verify the affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.