CVE-2026-64462 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel deployments, especially those utilizing the PCI: altera component, should assess exposure and prioritize verification of affected versions and deployments.

Why it matters

Defenders should assess exposure and prioritize verification of affected Linux kernel versions and deployments, especially those utilizing the PCI: altera component, due to potential resource leaks on probe failure.

• Verification of probe failure handling for resource leaks
• Assessment of necessity for chained IRQ handler and INTx domain setup
• Disable controller interrupts during IRQ teardown
• Review of Linux kernel versions and deployments for PCI: altera component usage

Technical summary

The Linux kernel's PCI: altera component had a vulnerability involving resource leaks on probe failure. The chained IRQ handler and INTx IRQ domain were not properly removed or disabled in case of a probe failure, potentially leading to stale data pointers and unmanaged interrupts. The vulnerability was addressed through Linux kernel patches that ensure proper teardown of IRQ setup and disable controller interrupts during IRQ teardown. Defenders should assess exposure and prioritize verification of affected Linux kernel versions and deployments, especially those utilizing the PCI: altera component.

Defensive priority

Defenders should assess exposure and prioritize verification of affected Linux kernel versions and deployments, especially those utilizing the PCI: altera component.

Recommended defensive actions

• Review Linux kernel versions and deployments for PCI: altera component usage
• Verify probe failure handling for resource leaks
• Disable controller interrupts during IRQ teardown
• Assess necessity of chained IRQ handler and INTx domain setup
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but specific affected versions and exploitation details are not provided. The Linux kernel patches are referenced, indicating fixes have been applied.

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.