CVE-2026-90388 iommu/dma: Check atomic pool allocation result directly
A missing check in the Linux kernel IOMMU DMA path can lead to a null pointer dereference and system crash when atomic pool allocation fails.
- 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-2026-90388?
CVE-2026-90388 is a high-severity vulnerability in Linux, published on 17 Sep 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/dma: Check atomic pool allocation result directly
The non-blocking, non-coherent allocation path uses dma_alloc_from_pool(), which returns the allocated page and fills cpu_addr only on success.
Do not rely on cpu_addr to detect allocation failure in this path. Check the returned page directly before using it for the IOMMU mapping.
Which versions are affected by CVE-2026-90388?
How do I fix CVE-2026-90388?
Apply the vendor's patch.
Is CVE-2026-90388 being exploited?
There is no known exploitation of CVE-2026-90388 in the wild and no public exploit code.
Sources
Also known as AZL-102071, BELL-CVE-2026-90388, DEBIAN-CVE-2026-90388, GHSA-f6r8-238v-4fm2, UBUNTU-CVE-2026-90388.