CVE-2026-90106 Linux CVE debrief

Who should care

Linux administrators and users of Linux kernel versions 4.15 and prior should assess exposure and apply patches. The vulnerability affects Linux kernel versions 4.15 and prior. Linux administrators and users should assess exposure and apply patches to prevent potential issues with neigh ha address reads in the net: bridge: arp/nd proxy.

Why it matters

Linux administrators and users should assess exposure and apply patches for Linux kernel versions 4.15 and prior to prevent potential issues with neigh ha address reads in the net: bridge: arp/nd proxy.

• Verify and apply patches for affected Linux kernel versions to prevent potential issues with neigh ha address reads.
• Assess exposure and update system configurations as necessary to ensure stable neigh ha address reads.

Technical summary

The Linux kernel vulnerability involves a fix for reading neigh ha addresses in the net: bridge: arp/nd proxy. The issue could result in torn or partial reads if the neigh is being updated. A stable snapshot of the address can be taken using neigh_ha_snapshot. This vulnerability affects Linux kernel versions 4.15 and prior. Linux administrators and users should assess exposure and apply patches. The CVE record and source item provide details on the vulnerability and its resolution in the Linux kernel. The stable snapshot of the address can be taken using neigh_ha_snapshot.

Defensive priority

Assess exposure and apply patches for Linux kernel versions 4.15 and prior.

Recommended defensive actions

• Assess exposure for Linux kernel versions 4.15 and prior
• Apply patches for affected Linux kernel versions
• Verify system configurations and update as necessary
• 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 source item provide details on the vulnerability and its resolution in the Linux kernel. The vulnerability affects Linux kernel versions 4.15 and prior. Linux administrators and users should assess exposure and apply patches. The stable snapshot of the address can be taken using neigh_ha_snapshot. The issue involves reading neigh ha addresses, which could result in torn or partial reads if the neigh is being updated.

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.