CVE-2026-93806 Linux CVE debrief

Who should care

Linux kernel system administrators and security teams should verify patch application, particularly for systems using cfg80211 for wireless connections. They should review system configurations to ensure cfg80211 is properly secured and monitor Linux kernel updates for related patches to maintain system security.

Why it matters

A vulnerability in the Linux kernel's cfg80211 has been resolved. Linux kernel system administrators and security teams should verify patch application, particularly for systems using cfg80211 for wireless connections, to prevent potential exploitation.

• Verify patch application to prevent potential wireless connection exploitation.
• Review system configurations to ensure cfg80211 is properly secured.
• Monitor Linux kernel updates for related patches to maintain system security.

Technical summary

The Linux kernel's cfg80211 has a vulnerability involving validating association response length before accessing status and IE fields. This issue has been patched in the Linux kernel to prevent potential exploitation through wireless connections. The patch defers resp_ie, resp_ie_len, and status to after the link-iteration loop, and uses a bool to remember whether the frame is S1G, then validates the appropriate minimum length and sets all three fields in a single if/else block. Funnel short-frame and SME-reject cleanup through a shared free_bss label for the abandon paths.

Defensive priority

Verify patch application on Linux kernel systems, particularly those using cfg80211 for wireless connections.

Recommended defensive actions

• Verify patch application on Linux kernel systems, particularly those using cfg80211 for wireless connections.
• Review system configurations for cfg80211 usage and ensure proper security measures are in place.
• Monitor Linux kernel updates for related patches and maintain system security.
• Perform vulnerability assessments to identify potential exposure.
• Implement compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution. However, specific versions of the Linux kernel affected are not mentioned in the supplied corpus. The vulnerability was patched to address the issue in cfg80211. Defensive verification tasks should focus on confirming patch application and reviewing system configurations for cfg80211 usage.

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.