CVE-2026-64152
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/07/2026
Last modified:
20/07/2026
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
iommu: Handle unmap error when iommu_debug is enabled<br />
<br />
Sashiko noticed a latent bug where the map error flow called iommu_unmap()<br />
which calls iommu_debug_unmap_begin()/iommu_debug_unmap_end() however<br />
since this is an error path the map flow never actually established the<br />
original iommu_debug_map() it will malfunction.<br />
<br />
Lift the unmap error handling into iommu_map_nosync() and reorder it so<br />
the trace_map()/iommu_debug_map() records the partial mapping and then<br />
immediately unmaps it. This avoid creating the unbalanced tracking and<br />
provides saner tracing instead of a unmap unmatched to any map.
Impact
Base Score 3.x
7.80
Severity 3.x
HIGH