---
id: CVE-2026-89455
title: 'PCI: plda: Fix use-after-free of event IRQs during teardown'
summary: |-
  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 ma…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 76c9113968079140cb2f885631db422170f32105 <
    1d0159e139261996a3ca21798d9114aab2124d3c
  - >-
    Linux >= 76c9113968079140cb2f885631db422170f32105 <
    01c2f0c66bd1f892db9c6e82976da6b463cc4427
  - >-
    Linux >= 76c9113968079140cb2f885631db422170f32105 <
    e3589ca5f2e6477774753a2202c21509428d4701
  - >-
    Linux >= 76c9113968079140cb2f885631db422170f32105 <
    26b73bae01d6eb81a4a38f36101812f20b2639de
  - Linux 6.11
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:47:04.758Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89455'
references:
  - url: 'https://git.kernel.org/stable/c/1d0159e139261996a3ca21798d9114aab2124d3c'
  - url: 'https://git.kernel.org/stable/c/01c2f0c66bd1f892db9c6e82976da6b463cc4427'
  - url: 'https://git.kernel.org/stable/c/e3589ca5f2e6477774753a2202c21509428d4701'
  - url: 'https://git.kernel.org/stable/c/26b73bae01d6eb81a4a38f36101812f20b2639de'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89455'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532263'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89455'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89455'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89455.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.1048
ingestedAt: '2026-09-14T00:35:28.531Z'
---

## Overview

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

- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 1d0159e139261996a3ca21798d9114aab2124d3c`
- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 01c2f0c66bd1f892db9c6e82976da6b463cc4427`
- `Linux >= 76c9113968079140cb2f885631db422170f32105 < e3589ca5f2e6477774753a2202c21509428d4701`
- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 26b73bae01d6eb81a4a38f36101812f20b2639de`
- `Linux 6.11`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json)