CVE-2026-98102 Linux CVE debrief

Who should care

Linux kernel maintainers, administrators of Linux-based systems, security teams responsible for patching and vulnerability management, and operators of Linux-based infrastructure should verify and apply patches. These individuals and teams should review Linux kernel IPv6 multicast configurations for potential exposure and ensure that compensating controls are in place while remediation is scheduled and verified. Vulnerability management and security teams,

Why it matters

A vulnerability in the Linux kernel's IPv6 multicast functionality has been addressed. The issue involves improper handling of source filters, which could lead to incorrect results when traversing the list of multicast sources under RCU. Linux kernel maintainers, administrators of Linux-based systems, and security teams should verify and apply patches.

• Verification of Linux kernel versions and patch application is necessary
• Potential for incorrect results when traversing multicast sources under RCU

Technical summary

The Linux kernel's IPv6 multicast functionality had a vulnerability in the ip6_mc_del1_src() function, which involved improper handling of source filters. This could lead to incorrect results when traversing the list of multicast sources under RCU. The issue has been resolved through patching, and Linux kernel maintainers, administrators, and security teams should verify and apply patches to prevent potential issues with concurrent readers. Affected systems may experience incorrect results when traversing multicast sources, and defenders should review and apply patches to ensure proper functionality.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel IPv6 multicast configurations for potential exposure
• Verify and apply patches for the Linux kernel
• Monitor for updates from the Linux kernel maintainers
• Perform a thorough review of the Linux kernel's IPv6 multicast functionality
• Verify Linux kernel versions and patch application
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and source metadata indicate a vulnerability in the Linux kernel's IPv6 multicast functionality. The issue has been resolved, but details on affected versions and exploitation are limited.

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.