---
id: CVE-2026-89453
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/amd: Put PCI device after handling PPR faults

  iommu_call_iopf_notifier() looks up the requester with
  pci_get_domain_bus_and_slot(), which returns a PCI device wi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/amd: Put PCI device after handling PPR faults

  iommu_call_iopf_notifier() looks up the requester with
  pci_get_domain_bus_and_slot(), which returns a PCI device wi…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 978d626b8f1a239acc635323d731c77eae54eb61 <
    1de4443f85e4405af00153cdf8ba73ff12a65036
  - >-
    Linux >= 978d626b8f1a239acc635323d731c77eae54eb61 <
    cfc5c1b2caa176dfd40b873a6ff07b11da34cc3e
  - >-
    Linux >= 978d626b8f1a239acc635323d731c77eae54eb61 <
    d1470e16c1977e6c94fadf6048deafaa4d150fec
  - >-
    Linux >= 978d626b8f1a239acc635323d731c77eae54eb61 <
    af3b69b16383fbc8fe5f61b5b0150d2e41ede71f
  - Linux 6.10
published: '2026-09-11'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:19:25.967'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89453'
references:
  - url: 'https://git.kernel.org/stable/c/1de4443f85e4405af00153cdf8ba73ff12a65036'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af3b69b16383fbc8fe5f61b5b0150d2e41ede71f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cfc5c1b2caa176dfd40b873a6ff07b11da34cc3e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1470e16c1977e6c94fadf6048deafaa4d150fec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89453.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89453'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532501'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89453'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89453'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89453.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-14T07:03:59.522Z'
epss: 0.002
epssPercentile: 0.10136
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-911
---

## Overview

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

iommu/amd: Put PCI device after handling PPR faults

iommu_call_iopf_notifier() looks up the requester with
pci_get_domain_bus_and_slot(), which returns a PCI device with its
reference count incremented.

Neither the successful iommu_report_device_fault() path nor the abort
path drops that reference, so every handled PPR request leaks a PCI
device reference.

This is the same ownership rule that was fixed for the old iommu_v2
ppr_notifier() path by commit 6cf0981c2233 ("iommu/amd: Fix pci device
refcount leak in ppr_notifier()"), but iommu_call_iopf_notifier() was
added later as a separate PPR/IOPF notifier path.

Drop the PCI device reference after handling the PPR entry.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89453.json)