# CVE-2026-89455

## Summary

- **CVE ID:** CVE-2026-89455
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

PCI: plda: Fix use-after-free of event IRQs during teardown

plda_pcie_irq_domain_deinit() removes pcie->event_domain via
irq_domain_remove(), but the per-event IRQs mapped from that domain
are requested with devm_request_irq() in plda_init_interrupts(). The
actual free_irq() for a devm-managed IRQ is deferred by devres until
after the calling probe()/remove() function returns.

This means irq_domain_remove() can free the domain's internal data
before the deferred free_irq() for IRQs still mapped into it has run.
When devres later processes that deferred cleanup, it can end up
dereferencing the already-freed domain.

Free each event IRQ explicitly with devm_free_irq() before removing
the domain. This triggers the free immediately and removes the IRQ
from the devres tracking list, so devres will not attempt to free it
a second time later.

Also dispose of the event, INTx, and MSI IRQ mappings with
irq_dispose_mapping() before their owning domains are removed.

Finally, guard the calls to irq_set_chained_handler_and_data() for
pcie->irq, pcie->msi_irq, and pcie->intx_irq so they only run when
those fields hold a valid (>0) IRQ number.

This is a pre-existing issue, flagged by automated review during work
on an earlier, unrelated patch to this driver.

Build-tested and boot-tested on StarFive VisionFive v1.2A board

## Affected Products

- Linux — Linux (76c9113968079140cb2f885631db422170f32105)
- Linux — Linux (6.11)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/1d0159e139261996a3ca21798d9114aab2124d3c)
- [CNA](https://git.kernel.org/stable/c/01c2f0c66bd1f892db9c6e82976da6b463cc4427)
- [CNA](https://git.kernel.org/stable/c/e3589ca5f2e6477774753a2202c21509428d4701)
- [CNA](https://git.kernel.org/stable/c/26b73bae01d6eb81a4a38f36101812f20b2639de)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._