CVE-2026-97518 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel systems using cfg80211 should assess exposure and prioritize patching. This includes roles managing Linux-based infrastructure, particularly those with wireless configurations.

Why it matters

Defenders should prioritize verifying and applying patches for the Linux kernel's cfg80211 vulnerability. This involves assessing exposure, verifying inventory, and implementing compensating controls where patches cannot be applied immediately. The vulnerability's impact is limited to systems using the Linux kernel with cfg80211, and its consequences are related to potential overflows of the iw_range::encoding_size array.

• Verify and prioritize patching for potential cfg80211 exposure
• Assess and manage compensating controls for unpatched systems
• Monitor for potential overflow of iw_range::encoding_size array

Technical summary

The Linux kernel's cfg80211 accepts duplicate wiphy cipher suite entries, which can lead to an overflow of the fixed iw_range::encoding_size array returned by SIOCGIWRANGE. Rejecting duplicate cipher suite entries in wiphy_register() resolves this issue. Defenders should prioritize verifying and applying patches for this vulnerability, particularly for systems using the Linux kernel with cfg80211. This involves assessing exposure, verifying inventory, and implementing compensating controls where patches cannot be applied immediately. The vulnerability's impact is limited to systems using the Linux kernel with cfg80211, and its consequences are related to potential overflows of the iw_range::encoding_size array.

Defensive priority

Defenders should prioritize verifying and applying patches for this vulnerability, particularly for systems using the Linux kernel with cfg80211. This involves assessing exposure, verifying inventory, and implementing compensating controls where patches cannot be applied immediately.

Recommended defensive actions

• Verify and apply patches for the Linux kernel's cfg80211 vulnerability
• Assess exposure and prioritize patching for systems using the Linux kernel with cfg80211
• Implement compensating controls where patches cannot be applied immediately
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• 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.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability. However, the scope of affected systems and versions is not explicitly stated, requiring further verification from official sources.

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.