CVE-2026-80930 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using the tpm_i2c_nuvoton module, should assess potential exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review system configurations, monitor logs, and apply patches to prevent IRQ handling issues.

Why it matters

Defenders should prioritize verifying and applying patches for the Linux kernel's tpm_i2c_nuvoton module to prevent potential IRQ handling issues. Linux kernel-based systems, particularly those using the tpm_i2c_nuvoton module, may be affected. The scope of affected systems and versions requires verification from official sources.

• Potential IRQ handling issues due to improper balancing of enable_irq calls
• Need for verification of system configurations and inventory for potential exposure
• Importance of monitoring system logs for IRQ handling issues

Technical summary

The i2c_nuvoton_wait_for_stat function in the Linux kernel's tpm_i2c_nuvoton module enables the IRQ before waiting for an interrupt handler to report a status change. If the wait times out or is interrupted before the handler runs, the function returns without balancing the enable_irq call. This can lead to improper IRQ handling. The vulnerability affects Linux kernel-based systems using the tpm_i2c_nuvoton module. Defenders should prioritize verifying and applying patches to prevent potential IRQ handling issues. The scope of affected systems and versions requires verification from official sources.

Defensive priority

Defenders should prioritize verifying and applying patches for the Linux kernel's tpm_i2c_nuvoton module to prevent potential IRQ handling issues.

Recommended defensive actions

• Verify and apply patches for the Linux kernel's tpm_i2c_nuvoton module
• Review system configurations and inventory for potential exposure
• Monitor system logs for IRQ handling issues
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in the Linux kernel's tpm_i2c_nuvoton module. However, the scope of affected systems and versions is not explicitly stated in the provided sources.

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.