---
id: CVE-2026-89447
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommufd: Avoid locking internal accesses during unmap

  iommufd_access_notify_unmap() skips internal accesses because they do
  not have an external unmap callback to invo…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommufd: Avoid locking internal accesses during unmap

  iommufd_access_notify_unmap() skips internal accesses because they do
  not have an external unmap callback to invo…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 <
    436189ee4bb2c7c993b945d68570dd38c3e4349e
  - >-
    Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 <
    50a66a63d1c841ae6b28a4551f642c1bba4c9529
  - >-
    Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 <
    0dbcdf4473a614adbd732d567c9b39ac0e040e0c
  - Linux 6.17
published: '2026-09-11'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:19:25.227'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89447'
references:
  - url: 'https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89447.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89447'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532181'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89447'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89447'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89447.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-14T12:19:18.969Z'
epss: 0.00176
epssPercentile: 0.07385
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/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:

iommufd: Avoid locking internal accesses during unmap

iommufd_access_notify_unmap() skips internal accesses because they do
not have an external unmap callback to invoke.

However, the current test calls iommufd_lock_obj() before checking
whether the access is internal. If iommufd_lock_obj() succeeds, the loop
then sees the internal access and continues, bypassing the matching
iommufd_put_object() used by the normal unmap path. This leaks the
object reference taken by iommufd_lock_obj().

Check for internal accesses first so skipped entries are never locked.

## 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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89447.json)