CVE-2026-64152 iommu: Handle unmap error when iommu_debug is enabled
A bug in the Linux kernel IOMMU subsystem causes unbalanced tracking and potential crashes when debug features are enabled during map error handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64152?
CVE-2026-64152 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-64152?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64152?
Apply the vendor's patch.
Is CVE-2026-64152 being exploited?
There is no known exploitation of CVE-2026-64152 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-64152, GHSA-2cx2-4725-6r7g, UBUNTU-CVE-2026-64152.