CVE-2026-64305 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and apply patches or mitigations as necessary. The vulnerability's impact on system stability and potential for elevation of privileges necessitates prompt attention from those responsible for maintaining and securing Linux-based systems. Security teams and vulnerability management teams should also be aware of this issue to plan

Why it matters

This vulnerability in the Linux kernel's crypto: qat component can lead to system instability, potential elevation of privileges, and data corruption or loss. Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and apply patches or mitigations as necessary.

• Potential system crashes or instability
• Possible elevation of privileges
• Potential data corruption or loss

Technical summary

The vulnerability is caused by inadequate locking during service table iterations in the Linux kernel's crypto: qat component. This can lead to list corruption or use-after-free. The issue has been resolved by holding the service_lock across all list_for_each_entry() iterations of service_table in several functions, ensuring the integrity of the service table during traversal. The fix prevents potential crashes or instability that could be triggered by concurrent modifications to the service table. Affected Linux kernel versions should be updated with the patch to mitigate this vulnerability.

Defensive priority

High

Recommended defensive actions

• Review and apply patches for the vulnerability
• Verify affected versions and upgrade if necessary
• Monitor system for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, including its description, CVSS score, and affected versions. Several source references are available, including patches for the 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.