CVE-2026-64461 PCI: mediatek: Fix IRQ domain leak when port fails to enable
A resource leak in the Linux kernel's MediaTek PCI driver can lead to denial of service when a port fails to enable.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64461?
CVE-2026-64461 is a denial of service vulnerability in Linux, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-64461?
How do I fix CVE-2026-64461?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-64461 being exploited?
There is no known exploitation of CVE-2026-64461 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64461, DEBIAN-CVE-2026-64461, GHSA-7rvv-9qxr-rh4x, ROOT-OS-UBUNTU-2204-CVE-2026-64461, UBUNTU-CVE-2026-64461.