CVE-2026-64463 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel maintenance, USB Type-C functionality, and systems utilizing the affected functionality should assess exposure to this vulnerability and prioritize verification and potential patching.

Why it matters

A high-severity vulnerability in the Linux kernel's USB Type-C TCP CI port driver requires verification and potential patching to prevent issues on probe failures and driver detach.

• Verification of Linux kernel versions is necessary to determine exposure.
• Potential issues on probe failures and driver detach require attention.

Technical summary

The vulnerability occurs in the USB Type-C TCP CI port driver of the Linux kernel. The TCPCI port is registered before requesting the interrupt and enabling alert interrupts. If either of these steps fails, the probe function returns without unregistering the TCPCI port. This issue has been resolved by registering a devres action immediately after tcpci_register_port() succeeds, ensuring tcpci_unregister_port() runs on later probe failures and on driver detach. The fix prevents potential issues on probe failures and driver detach by ensuring proper cleanup of the TCPCI port. Defenders should prioritize verifying Linux kernel versions and assessing exposure to this vulnerability, especially in systems utilizing

Defensive priority

Defenders should prioritize verifying Linux kernel versions and assessing exposure to this vulnerability, especially in systems utilizing the affected USB Type-C functionality.

Recommended defensive actions

• Verify Linux kernel versions to determine if they are affected by this vulnerability.
• Assess exposure to this vulnerability, especially in systems utilizing the affected USB Type-C functionality.
• Consider applying patches or updates provided by the Linux kernel maintainers to address this issue.
• 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 identified during static-analysis research reviewing kernel code. The issue has been resolved by registering a devres action immediately after tcpci_register_port() succeeds, ensuring tcpci_unregister_port() runs on later probe failures and on driver detach.

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.