# 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.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jul 2026
- **Updated:** 17 Aug 2026
- **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

## 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.

## Is CVE-2026-64461 being exploited?

There is no known exploitation of CVE-2026-64461 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-64461 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-64461 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-64461/ (Markdown: https://insights.sbomify.com/CVE-2026-64461/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-64461
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64461
- OSV: https://osv.dev/vulnerability/CVE-2026-64461

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-64461/
Summaries are generated and may contain mistakes; the official description above is the record.