CVE-2026-98705 Linux CVE debrief

Who should care

Linux kernel administrators and maintainers should verify and apply patches for mac80211 to prevent potential mesh path limit bypass. Affected operator, platform, vulnerability-management, and security-team impact should be assessed, and compensating controls may be necessary for exposed systems. Linux kernel deployments using mac80211 are potentially impacted, and administrators should review and update mesh path configurations to prevent potential issues

Why it matters

A vulnerability in the Linux kernel's mac80211 has been addressed, where proxy-path churn can drive the interface path counter negative, allowing later mesh path additions to exceed MESH_MAX_MPATHS. Linux kernel administrators and maintainers should verify and apply patches for mac80211 to prevent potential mesh path limit bypass.

• Verify Linux kernel version and apply patches for mac80211 to prevent potential mesh path limit bypass
• Review and update mesh path configurations to prevent potential issues
• Monitor Linux kernel updates for related security patches

Technical summary

The Linux kernel's mac80211 has a vulnerability where proxy-path churn can drive the interface path counter negative, allowing later mesh path additions to exceed MESH_MAX_MPATHS. This has been resolved by reserving the shared quota before allocating a proxy path and releasing it on every unsuccessful addition. The vulnerability affects Linux kernel deployments using mac80211, potentially impacting network security and stability. Technical details include the need to update Linux kernel versions and review mesh path configurations.

Defensive priority

Verify and apply patches for Linux kernel mac80211 to prevent potential mesh path limit bypass.

Recommended defensive actions

• Verify Linux kernel version and apply patches for mac80211
• Review and update mesh path configurations to prevent potential issues
• Monitor Linux kernel updates for related security patches
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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
• technicalSummary

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution in the Linux kernel. However, specific version information and exploitation details are not provided. Defenders should verify Linux kernel versions, review mesh path configurations, and monitor kernel updates for related security patches. The vulnerability's impact on network security and stability should be assessed, and compensating controls may be necessary for exposed systems.

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.