---
id: CVE-2026-52952
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

  In __iommu_group_set_domain_internal(), concurrent domain attachments are
  rejected when any device…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

  In __iommu_group_set_domain_internal(), concurrent domain attachments are
  rejected when any device…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-825
published: '2026-06-24'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52952'
references:
  - url: 'https://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://access.redhat.com/security/cve/CVE-2026-52952'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2492422'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52952.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00177
epssPercentile: 0.06529
ingestedAt: '2026-07-11T13:13:24.830Z'
---

## Overview

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

iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

In __iommu_group_set_domain_internal(), concurrent domain attachments are
rejected when any device in the group is recovering. This is necessary to
fence concurrent attachments to a multi-device group where devices might
share the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in
__iommu_group_set_domain_nofail().

Other IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such
as __iommu_group_set_core_domain and __iommu_release_dma_ownership, should
not be rejected, as the domain would be freed anyway in these nofail paths
while group->domain is still pointing to it. So pci_dev_reset_iommu_done()
could trigger a UAF when re-attaching group->domain.

Honor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through
the group->recovery_cnt fence, so as to update the group->domain pointer.
Instead add a gdev->blocked check in the device iteration loop, to prevent
any concurrent per-device detachment.

## Remediation

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