---
id: CVE-2026-89455
title: >-
  kernel: PCI: plda: Fix use-after-free of event IRQs during teardown
  (CVE-2026-89455)
summary: >-
  A flaw was found in the Linux kernel's PCI PLDA driver. During the teardown of
  Interrupt Request (IRQ) domains, the system can attempt to access memory that
  has already been freed. This 'use-after-free' vulnerability occurs because the
  dom…
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: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:58:26+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json'
references:
  - 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
  - url: 'https://git.kernel.org/stable/c/01c2f0c66bd1f892db9c6e82976da6b463cc4427'
  - url: 'https://git.kernel.org/stable/c/1d0159e139261996a3ca21798d9114aab2124d3c'
  - url: 'https://git.kernel.org/stable/c/26b73bae01d6eb81a4a38f36101812f20b2639de'
  - url: 'https://git.kernel.org/stable/c/e3589ca5f2e6477774753a2202c21509428d4701'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.002
epssPercentile: 0.10104
ingestedAt: '2026-09-14T00:35:28.531Z'
---

## Overview

A flaw was found in the Linux kernel's PCI PLDA driver. During the teardown of Interrupt Request (IRQ) domains, the system can attempt to access memory that has already been freed. This 'use-after-free' vulnerability occurs because the domain's internal data is released before all associated IRQs are properly deallocated. This can lead to system instability or crashes.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json)

**kernel: PCI: plda: Fix use-after-free of event IRQs during teardown** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10

No fix planned:

- Red Hat Enterprise Linux 10

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred