CVE-2026-98701 Linux CVE debrief

Who should care

Linux kernel administrators and users who rely on mac80211 for mesh networking should assess their exposure and apply the patch to prevent MESH_MAX_MPATHS exhaustion. They should also monitor Linux kernel's mac80211 for repeated failed or duplicate mesh path additions and verify mesh path additions to prevent MESH_MAX_MPATHS exhaustion.

Why it matters

The Linux kernel's mac80211 vulnerability could lead to MESH_MAX_MPATHS exhaustion, stopping new paths to reachable destinations from being created. Linux kernel administrators and users who rely on mac80211 for mesh networking should assess their exposure and apply the patch.

• Verify mesh path additions to prevent MESH_MAX_MPATHS exhaustion.
• Monitor Linux kernel's mac80211 for repeated failed or duplicate mesh path additions.
• Apply patch to prevent vulnerability exploitation.

Technical summary

The Linux kernel's mac80211 has a vulnerability that could lead to exhaustion of MESH_MAX_MPATHS due to repeated failed or duplicate mesh path additions. This stops new paths to reachable destinations from being created. The vulnerability has been resolved by releasing the mesh path quota on failed additions, preventing MESH_MAX_MPATHS exhaustion and ensuring new paths to reachable destinations can be created. The patch should be reviewed and applied to prevent vulnerability exploitation. The Linux kernel's mac80211 configuration should be verified to ensure it is properly set up to handle mesh path additions.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch for the Linux kernel's mac80211 to prevent MESH_MAX_MPATHS exhaustion.
• Monitor the Linux kernel's mac80211 for repeated failed or duplicate mesh path additions.
• Verify the Linux kernel's mac80211 configuration to ensure it is properly set up to handle mesh path additions.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• 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.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in the Linux kernel's mac80211. However, the CVSS score and severity are not provided. The vulnerability has been resolved by releasing the mesh path quota on failed additions. Evidence is limited to CVE and NVD entries. Defenders should verify mesh path additions and monitor Linux kernel's mac80211 for repeated failed or duplicate mesh path additions.

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.