# CVE-2026-89454: PCI: plda: Fix IRQ domain leaks in the error paths of plda_init_interrupts()

> A resource leak in the Linux kernel PCI driver allows local attackers to exhaust system resources, potentially causing denial of service.

- **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:** 11 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-89454, DEBIAN-CVE-2026-89454, GHSA-ww3r-fjgm-2rcq, UBUNTU-CVE-2026-89454

## What is CVE-2026-89454?

CVE-2026-89454 is a denial of service vulnerability in Linux, published on 11 Sep 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: plda: Fix IRQ domain leaks in the error paths of plda_init_interrupts()

plda_init_interrupts() initializes IRQ domains and creates IRQ mapping but
does not unwind them when later step fails.

If platform_get_irq() or either irq_create_mapping() fails
in plda_init_interrupts(), the domains are never deinitialized. If
irq_create_mapping() fails, port->intx_irq stays initialized.

Hence, remove the IRQ domains in the error path by calling
plda_pcie_irq_domain_deinit().

Since plda_pcie_irq_domain_deinit() now disposes of the intx_irq and
msi_irq mappings itself before removing their domains, the msi_irq
mapping failure path can go directly to err_irq_domain_deinit instead of
disposing of port->intx_irq separately first.

This issue was found by automated review of sashiko-bot

[mani: commit log]

## Which versions are affected by CVE-2026-89454?


## How do I fix CVE-2026-89454?

Apply the vendor's patch.

## Is CVE-2026-89454 being exploited?

There is no known exploitation of CVE-2026-89454 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89454 and fix it if it is affected.

What it is: CVE-2026-89454 is a denial of service vulnerability in Linux, published on 11 Sep 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-2026-89454 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-2026-89454/ (Markdown: https://insights.sbomify.com/CVE-2026-89454/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89454
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89454
- OSV: https://osv.dev/vulnerability/CVE-2026-89454

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89454/
Summaries are generated and may contain mistakes; the official description above is the record.