CVE-2026-64382 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers responsible for maintaining and securing Linux-based systems should be aware of this vulnerability and take necessary actions to prevent potential double-free errors.

Why it matters

The double-free vulnerability in the Linux kernel's SMB2_open() replay functionality can lead to potential security issues if not addressed. Linux system administrators and security teams should prioritize verifying and applying the patch to prevent potential double-free errors.

• Verify patch application to prevent double-free errors.
• Review and update Linux kernel versions to ensure they are up-to-date with the latest security patches.
• Monitor system logs for potential exploitation attempts.

Technical summary

The Linux kernel's SMB2_open() replay functionality is vulnerable to a double-free error. This occurs when a response-bearing attempt returns a replayable error and frees its response buffer. If SMB2_open_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. The issue is resolved by resetting response bookkeeping before each attempt. Linux system administrators and security teams should prioritize verifying and applying the patch to prevent potential double-free errors in the SMB2_open() replay functionality. Affected product deployments should be reviewed for potential vulnerabilities, and compensating controls should be implemented where necessary.

Defensive priority

Linux system administrators and security teams should prioritize verifying and applying the patch to prevent potential double-free errors in the SMB2_open() replay functionality.

Recommended defensive actions

• Verify and apply the patch to prevent potential double-free errors in the SMB2_open() replay functionality.
• Review Linux kernel versions and ensure they are up-to-date with the latest security patches.
• Monitor system logs for potential exploitation attempts.
• Perform a thorough review of system configurations to identify potential vulnerabilities.
• Implement additional monitoring and logging to detect potential exploitation attempts.
• Conduct regular security audits to ensure compliance with security best practices.
• Review and update incident response plans to address potential security incidents.

Evidence notes

The CVE record and source item provide details on the double-free vulnerability in the Linux kernel's SMB2_open() replay functionality. The official CVE Program record and NVD vulnerability detail page offer additional information.

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.