---
id: CVE-2026-89449
title: >-
  kernel: iommu: Fix dev_iommu memory leak when device_add fails in
  iommu_mock_device_add (CVE-2026-89449)
summary: >-
  A flaw was found in the Linux kernel's Input-Output Memory Management Unit
  (IOMMU) subsystem. When a device addition fails during the
  `iommu_mock_device_add()` operation, the allocated device IOMMU structure is
  not properly deallocated. Th…
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-772
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:55:16+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89449.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89449.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89449'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532262'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89449'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89449'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89449.mbox
  - url: 'https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5'
  - url: 'https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370'
  - url: 'https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00166
epssPercentile: 0.06252
ingestedAt: '2026-09-14T00:35:28.531Z'
---

## Overview

A flaw was found in the Linux kernel's Input-Output Memory Management Unit (IOMMU) subsystem. When a device addition fails during the `iommu_mock_device_add()` operation, the allocated device IOMMU structure is not properly deallocated. This oversight leads to a memory leak, which over time could be exploited by a local attacker to cause a denial of service (DoS) by exhausting system memory.

## 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-2026-89449.json)

**kernel: iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.

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

Not affected:

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

## Remediation

Fix deferred