---
id: CVE-2026-89451
title: 'iommu/sva: Set handle->dev before the SVA handle is visible'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/sva: Set handle->dev before the SVA handle is visible

  iommu_attach_device_pasid() installs the new SVA attach handle in the
  group PASID lookup before iommu_sva_b…
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-476
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <
    c4c71368bc5c5b3840590d39b4cfa12d733cadf4
  - >-
    Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <
    bcffb1c75da8fc9d51168ff9f09d471c26507912
  - >-
    Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <
    968e9a1f71140c86dc4092f6b361e997923f3813
  - >-
    Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <
    37a96a30617a4c96f048a5874c00509bc4fe4d85
  - >-
    Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <
    530f8f9c3546cb3ebee1b135375aaee08a073ebb
  - Linux 6.2
published: '2026-09-11'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:47:29.668Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89451'
references:
  - url: 'https://git.kernel.org/stable/c/c4c71368bc5c5b3840590d39b4cfa12d733cadf4'
  - url: 'https://git.kernel.org/stable/c/bcffb1c75da8fc9d51168ff9f09d471c26507912'
  - url: 'https://git.kernel.org/stable/c/968e9a1f71140c86dc4092f6b361e997923f3813'
  - url: 'https://git.kernel.org/stable/c/37a96a30617a4c96f048a5874c00509bc4fe4d85'
  - url: 'https://git.kernel.org/stable/c/530f8f9c3546cb3ebee1b135375aaee08a073ebb'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89451.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89451'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532460'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89451'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89451'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89451.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.1059
ingestedAt: '2026-09-14T00:35:28.531Z'
---

## Overview

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

iommu/sva: Set handle->dev before the SVA handle is visible

iommu_attach_device_pasid() installs the new SVA attach handle in the
group PASID lookup before iommu_sva_bind_device() returns. A concurrent
bind can therefore find and reuse the same handle after iommu_sva_lock is
dropped.

handle->dev was initialized after dropping iommu_sva_lock. This leaves a
window where a racing bind can return a handle whose dev pointer is still
NULL. A subsequent iommu_sva_unbind_device() can then dereference it via
handle->dev->iommu_group.

Initialize handle->dev before releasing iommu_sva_lock so any visible SVA
handle is fully initialized.

## Affected

- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < c4c71368bc5c5b3840590d39b4cfa12d733cadf4`
- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < bcffb1c75da8fc9d51168ff9f09d471c26507912`
- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 968e9a1f71140c86dc4092f6b361e997923f3813`
- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 37a96a30617a4c96f048a5874c00509bc4fe4d85`
- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 530f8f9c3546cb3ebee1b135375aaee08a073ebb`
- `Linux 6.2`

## 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, 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 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89451.json)