CVE-2026-98702 Linux CVE debrief

Who should care

Linux kernel developers, administrators, and users of Linux-based systems should assess exposure and apply patches or updates. They should verify Linux kernel versions to determine if vulnerable and review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

A vulnerability in the Linux kernel's mac80211 component can cause a kernel panic when a received CSA frame with invalid 320 MHz bandwidth is processed on a non-6 GHz link.

• Verify Linux kernel versions to determine if vulnerable
• Assess exposure to potentially manipulated CSA frames
• Apply patches or updates provided by Linux kernel developers

Technical summary

The Linux kernel's mac80211 component does not properly handle invalid 320 MHz CSA bandwidth indications from received CSA frames on non-6 GHz links, potentially causing a kernel panic. The issue is resolved by rejecting the channel definition before entering the VHT operation conversion. This preserves the existing CSA fallback while avoiding both the warning and the uninitialized read. The vulnerability has been addressed, but further verification is recommended to assess exposure and apply patches or updates. The affected product context is the Linux kernel's mac80211 component, and the defensive impact is to verify Linux kernel versions and assess exposure to potentially manipulated CSA frames.

Defensive priority

Verify Linux kernel versions and assess exposure to potentially manipulated CSA frames

Recommended defensive actions

• Verify Linux kernel versions to determine if vulnerable
• Assess exposure to potentially manipulated CSA frames
• Apply patches or updates provided by Linux kernel developers
• 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 CVE record and NVD entry provide details on the vulnerability, which is related to the Linux kernel's handling of CSA frames. The vendor, Linux kernel developers, have addressed the issue. Further verification is recommended to assess exposure to potentially manipulated CSA frames and apply patches or updates provided by Linux kernel developers. The vulnerability's impact can be mitigated by verifying Linux kernel versions and assessing exposure to potentially manipulated CSA frames.

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.