CVE-2026-64435 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, system administrators responsible for Linux systems, security teams monitoring Linux system vulnerabilities

Why it matters

A data race vulnerability in the Linux kernel's audit subsystem requires attention from Linux kernel developers, maintainers, and system administrators. The vulnerability can lead to potential crashes, information leaks, or corruption, and increases the risk of privilege escalation or denial-of-service attacks. Linux kernel updates should be thoroughly tested and validated to address this issue.

• Potential crashes or instability in systems using the Linux kernel's audit subsystem
• Possible information leaks or corruption due to data races
• Increased risk of privilege escalation or denial-of-service attacks
• Need for thorough testing and validation of Linux kernel updates

Technical summary

The Linux kernel's audit subsystem has a data race vulnerability. Multiple readers access the audit_queue length without proper synchronization, while a writer modifies it under a spinlock. This issue affects various Linux kernel versions, including those prior to the fixed versions mentioned in the source code references. The vulnerability can lead to potential crashes, information leaks, or corruption, and increases the risk of privilege escalation or denial-of-service attacks. Linux kernel updates should be thoroughly tested and validated to address this issue.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided source code patches to address the data race vulnerability
• Update Linux kernel to a version that includes the fix
• Monitor system logs for potential issues related to the audit subsystem
• 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 CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to source code changes. The data race vulnerability in the Linux kernel's audit subsystem requires attention from Linux kernel developers, maintainers, and system administrators. The vulnerability can lead to potential crashes, information leaks, or corruption, and increases the risk of privilege escalation or denial-of-service attacks. Defenders should verify the provided source code patches and update the

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.