CVE-2026-52952

/// Technical 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->block

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References