CVE-2026-64152 is a vulnerability in Linux Kernel
Published on July 19, 2026
iommu: Handle unmap error when iommu_debug is enabled
In 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.
Products Associated with CVE-2026-64152
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Affected Versions
Linux:- Version ccc21213f013834b484cdcc738e282f963fcfc97 and below 0cd028806efc148a75d4acf711d21db335a89661 is affected.
- Version ccc21213f013834b484cdcc738e282f963fcfc97 and below 0735c54804c709d1b292f3b6947cfb560b2ce552 is affected.
- Version 7.0 is affected.
- Before 7.0 is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.