CVE-2026-64461
Received Received - Intake

PCI IRQ Domain Leak in Mediatek Kernel Driver

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: PCI: mediatek: Fix IRQ domain leak when port fails to enable When mtk_pcie_enable_port() fails, mtk_pcie_port_free() removes the port from pcie->ports and frees the port structure. However, the IRQ domains set up earlier by mtk_pcie_init_irq_domain() are never freed. Fix this by refactoring mtk_pcie_irq_teardown() into a per-port helper, mtk_pcie_irq_teardown_port(), and calling it from mtk_pcie_setup() when mtk_pcie_enable_port() fails. Since the IRQ teardown must only happen in the probe error path (during resume, child devices may have active MSI mappings and the NOIRQ context prohibits sleeping locks), mtk_pcie_enable_port() is changed to return an error code so callers can distinguish the two paths and act accordingly. This issue was reported by Sashiko while reviewing the EcoNet EN7528 SoC support series.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-64461
EUVD
EUVD-2026-48805

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mediatek linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a Linux kernel vulnerability in the PCI driver for Mediatek hardware. When a PCI port fails to enable, the system does not properly clean up IRQ domains, leading to a resource leak. The fix involves refactoring the IRQ teardown process to ensure resources are freed correctly when a port fails during setup.

Detection Guidance

This vulnerability is specific to the Linux kernel's PCI driver for Mediatek hardware. Detection requires checking kernel logs for PCI-related errors or IRQ domain leaks during port initialization. Use commands like dmesg | grep -i pcie or journalctl -k | grep -i pcie to inspect kernel messages for failures in mtk_pcie_enable_port().

Impact Analysis

This vulnerability could lead to system instability or resource exhaustion due to unfreed IRQ domains. It may cause crashes or degraded performance if PCI ports repeatedly fail to enable. Systems using Mediatek PCI hardware are primarily affected.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for CVE-2026-64461. If using a Mediatek-based system, ensure the PCI driver is patched. Monitor kernel logs for PCI errors after applying updates.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-64461. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart