CVE-2026-64348 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux system administrators, and users of Linux systems with EHCI or FOTG210 controllers should be aware of this vulnerability and take steps to patch affected kernel versions.

Why it matters

CVE-2026-64348 is a memory leak vulnerability in the Linux kernel's USB subsystem that can lead to system instability and potential denial-of-service conditions if left unaddressed. Linux kernel maintainers and users should prioritize patching affected kernel versions to prevent potential memory leaks and ensure system stability.

• Memory leaks can lead to system instability and crashes if left unaddressed.
• Successful exploitation could result in denial-of-service conditions due to memory exhaustion.
• Patching affected kernel versions will prevent potential memory leaks and ensure system stability.
• Linux kernel maintainers and users should verify the patches are applied correctly to prevent potential issues.

Technical summary

The Linux kernel's USB subsystem has a memory leak vulnerability in the EHCI and FOTG210 isochronous submit functionality. When a submit fails before the URB is linked, the staged schedule remains attached to urb->hcpriv, leading to a memory leak. This issue was first flagged by an experimental analysis tool and confirmed through manual inspection in v7.1.1. Affected Linux kernel versions should be patched to prevent potential memory leaks and ensure system stability. Linux kernel maintainers and users should prioritize patching affected kernel versions to prevent potential memory leaks and ensure system stability. The vulnerability can lead to system instability and potential denial-of-service conditions if  

Defensive priority

Linux kernel maintainers and users should prioritize patching affected kernel versions to prevent potential memory leaks and ensure system stability.

Recommended defensive actions

• Review and apply patches provided by the Linux kernel maintainers for affected versions.
• Inventory Linux systems using EHCI or FOTG210 controllers for potential exposure.
• Monitor system memory usage for unusual patterns that could indicate a memory leak.
• Verify patch application and configuration on affected systems.
• Check system logs for signs of memory leaks or instability.
• Perform regular security audits to identify potential vulnerabilities.
• Engage with Linux kernel maintainers for support and guidance on patching and mitigation.

Evidence notes

The vulnerability was identified through an experimental analysis tool and confirmed via manual inspection. No runtime testing was performed due to lack of access to an EHCI host controller with a USB isochronous device.

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.