CVE-2026-64152

iommu: Handle unmap error when iommu_debug is enabled

State: Published
Severity: 7.8 High
Published: Jul 19, 2026
Updated: Aug 5, 2026
Reserved: Jul 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ccc21213f013834b484cdcc738e282f963fcfc97 to before 0cd028806efc148a75d4acf711d21db335a89661Affected ccc21213f013834b484cdcc738e282f963fcfc97 to before 0735c54804c709d1b292f3b6947cfb560b2ce552Affected
LinuxLinux	7.0Affected before 7.0Not affected 7.0.11 through 7.0.*Not affected 7.1 and laterNot affected

References

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