CVE-2026-64377 Linux CVE debrief

Who should care

Linux kernel maintainers and users, system administrators, and security teams responsible for Linux kernel-based systems should review and apply patches provided by the Linux kernel maintainers, update Linux kernel to a version that includes the fix, and monitor system logs for potential exploitation attempts. They should also review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring,

Why it matters

The CVE-2026-64377 vulnerability in the Linux kernel's cpufreq-qcom-cpufreq-hw module can lead to a double-free, potentially causing denial of service, elevation of privileges, or system crashes. Linux kernel maintainers and users, system administrators, and security teams responsible for Linux kernel-based systems should review and apply patches provided by the Linux kernel maintainers, update Linux kernel to a version that includes the fix, and monitor system logs for potential exploitation attempts.

• Potential denial of service (DoS) due to double-free
• Possible elevation of privileges
• Increased risk of system crashes or instability

Technical summary

The Linux kernel's cpufreq-qcom-cpufreq-hw module is vulnerable to a double-free. The vulnerability occurs when the kfree() function is called on policy->driver_data, which is a devm-managed allocation. This can lead to a double-free when the platform device is later detached. The affected product context is the Linux kernel, and the defensive impact is a potential denial of service, elevation of privileges, or system crashes. The source-grounded technical framing is based on the CVE record and NVD entry. The technical details are limited to the information provided by the source.

Defensive priority

High

Recommended defensive actions

• Review and apply patches provided by the Linux kernel maintainers
• Update Linux kernel to a version that includes the fix
• Monitor system logs for potential exploitation attempts
• 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 was found by a static analysis tool. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and weaknesses. The evidence limits are based on the source-provided information, and defenders should verify the affected scope and severity. The known affected scope is the Linux kernel's cpufreq-qcom-cpufreq-hw module, and the unknown affected scope is other potential users of the Linux kernel.

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.