iommu/iommufd: Fix IOPF group ownership UAF

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74520
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:57 UTC
Updated2026-08-15 13:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iommu/iommufd: Fix IOPF group ownership UAF iopf_group_alloc() links each last-page IOPF group into the generic IOPF pending list before invoking the domain fault handler. iommufd_fault_iopf_handler() also queued an accepted group in the IOMMUFD deliver list without removing it from the generic pending list. When detach or HWPT replacement drops the device's IOPF reference count to zero, an IOMMU driver may call iopf_queue_remove_device(). That function responds to and frees groups through the generic pending list without removing the same groups from IOMMUFD's deliver list or response xarray. A later read, response, or cleanup can then access the freed group and cause a UAF. Fix this by dequeuing an accepted group from the generic pending list before IOMMUFD queues it for userspace response. Make iopf_group_response() send a response regardless of pending-list membership, so the dequeued group can still be completed by IOMMUFD.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 34765cbc679c59ea5d952d738d2d16bf4aadc497 6da8f37419dd4c456f26fc203f04e000186f4b3d git Not specified
CNA Linux Linux affected 34765cbc679c59ea5d952d738d2d16bf4aadc497 4e74a369236424114b94cf6a9f5ff9e848b430b4 git Not specified
CNA Linux Linux affected 34765cbc679c59ea5d952d738d2d16bf4aadc497 738e6f32e61d80b554e37015ecb7bc620b88001c git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/738e6f32e61d80b554e37015ecb7bc620b88001c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6da8f37419dd4c456f26fc203f04e000186f4b3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e74a369236424114b94cf6a9f5ff9e848b430b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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