CVE-2026-97440 Linux CVE debrief

Who should care

Linux kernel maintainers, system administrators, and security teams responsible for managing Linux-based systems should assess exposure and consider applying patches or updates to prevent potential issues. They should review Linux kernel configurations and versions to determine exposure and verify system inventory and patch levels.

Why it matters

A vulnerability in the Linux kernel's qrtr_send_resume_tx() function can cause a node reference count leak when memory allocation fails. Linux kernel maintainers, system administrators, and security teams should assess exposure and consider applying patches or updates to prevent potential issues.

• Verify node reference count management in Linux kernel configurations
• Assess system exposure to potential node reference count leaks
• Prioritize patching or updating Linux kernel versions to prevent potential issues

Technical summary

The qrtr_send_resume_tx() function in the Linux kernel does not properly release a node reference when memory allocation fails, leading to a node reference count leak. This issue was addressed by adding a call to qrtr_node_release() in the allocation failure path. The vulnerability affects Linux kernel versions, and Linux kernel maintainers, system administrators, and security teams should assess exposure and consider applying patches or updates to prevent potential issues. The vulnerability can have operational impacts on system stability and security if not properly addressed.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel configurations and versions to determine exposure
• Verify system inventory and patch levels
• Consider applying patches or updates provided by the Linux kernel maintainers
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected systems and versions is not explicitly stated, requiring verification from official sources. To verify, defenders should check the official CVE Program record and NIST NVD detail page for further information on affected scope, severity, and vendor guidance. Linux kernel maintainers, system administrators, and security teams should review Linux kernel configurations and versions to determine exposure and consider applying patches or mitig

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.