iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

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Summary

CVECVE-2026-52952
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:05 UTC
Updated2026-06-24 17:17:05 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c279e83953d937470f8a6e69b69f62608714f13f 8fc289e809f3eb7e36cadc4684ab6fad747a5a93 git Not specified
CNA Linux Linux affected c279e83953d937470f8a6e69b69f62608714f13f 5474e6e17a262db45c60575c73f70210f5c7001f git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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