CVE-2026-97940 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should assess exposure and prioritize patching. They should review and apply the provided kernel patches to fix the vulnerability, monitor system logs for potential exploitation attempts, and consider implementing additional security measures to prevent exploitation. Affected operator, platform, vulnerability-management, and security-team impact should be

Why it matters

The Linux kernel's IPv6 route iterator has a use-after-free vulnerability that can lead to system crashes or potentially allow an attacker to execute arbitrary code. Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should assess exposure and prioritize patching.

• Potential system crashes or instability
• Possible code execution or privilege escalation
• Increased attack surface for malicious actors
• Need for prompt patching and verification

Technical summary

The Linux kernel's IPv6 route iterator has a use-after-free vulnerability. When the iterator is stopped, it fails to properly unlink the walker, allowing it to access freed memory. This can lead to a crash or potentially allow an attacker to execute arbitrary code. The vulnerability is caused by the ipv6_route_native_seq_stop function not properly unlinking the walker when the iterator is stopped. This allows the walker to access freed memory, leading to a use-after-free vulnerability. Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should assess exposure and prioritize patching.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided kernel patches to fix the vulnerability
• Monitor system logs for potential exploitation attempts
• Consider implementing additional security measures to prevent exploitation
• 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 vulnerability is caused by the ipv6_route_native_seq_stop function not properly unlinking the walker when the iterator is stopped. This allows the walker to access freed memory, leading to a use-after-free vulnerability.

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.