iommu: Handle unmap error when iommu_debug is enabled

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Summary

CVECVE-2026-64152
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:57 UTC
Updated2026-07-19 16:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iommu: Handle unmap error when iommu_debug is enabled Sashiko noticed a latent bug where the map error flow called iommu_unmap() which calls iommu_debug_unmap_begin()/iommu_debug_unmap_end() however since this is an error path the map flow never actually established the original iommu_debug_map() it will malfunction. Lift the unmap error handling into iommu_map_nosync() and reorder it so the trace_map()/iommu_debug_map() records the partial mapping and then immediately unmaps it. This avoid creating the unbalanced tracking and provides saner tracing instead of a unmap unmatched to any map.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ccc21213f013834b484cdcc738e282f963fcfc97 0cd028806efc148a75d4acf711d21db335a89661 git Not specified
CNA Linux Linux affected ccc21213f013834b484cdcc738e282f963fcfc97 0735c54804c709d1b292f3b6947cfb560b2ce552 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0735c54804c709d1b292f3b6947cfb560b2ce552 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0cd028806efc148a75d4acf711d21db335a89661 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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