iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset_CVE-2026-52952

8.8 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Description

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.

AI Analysis

Use-after-free vulnerability in the iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

Basic Information

ID CVE-2026-52952

Source Linux

Published Jun 24, 2026 at 16:28

Modified Jun 28, 2026 at 06:37

Affected Product

Vendor Linux

Product Linux

Version c279e83953d937470f8a6e69b69f62608714f13f

Affected Versions Linux Linux c279e83953d937470f8a6e69b69f62608714f13f
Linux Linux c279e83953d937470f8a6e69b69f62608714f13f
Linux Linux 7.0

AI Assessment

AI Score 8.8 / 10

AI Severity High

Vendor Linux

Product Linux Kernel

Version 7.0, c279e83953d937470f8a6e69b69f62608714f13f

References

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    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset\n\nIn __iommu_group_set_domain_internal(), concurrent domain attachments are\nrejected when any device in the group is recovering. This is necessary to\nfence concurrent attachments to a multi-device group where devices might\nshare the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in\n__iommu_group_set_domain_nofail().\n\nOther IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such\nas __iommu_group_set_core_domain and __iommu_release_dma_ownership, should\nnot be rejected, as the domain would be freed anyway in these nofail paths\nwhile group->domain is still pointing to it. So pci_dev_reset_iommu_done()\ncould trigger a UAF when re-attaching group->domain.\n\nHonor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through\nthe group->recovery_cnt fence, so as to update the group->domain pointer.\nInstead add a gdev->blocked check in the device iteration loop, to prevent\nany concurrent per-device detachment.",
    "published": "2026-06-24T16:28:35.247Z",
    "modified": "2026-06-28T06:37:10.071Z",
    "type": "cve",
    "title": "iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93\nhttps://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f",
    "id": "CVE-2026-52952",
    "bulletinFamily": "",
    "cwe": null,
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    "sourceData": "Linux Linux c279e83953d937470f8a6e69b69f62608714f13f\nLinux Linux c279e83953d937470f8a6e69b69f62608714f13f\nLinux Linux 7.0",
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