CVE-2026-89993 dmaengine: dw-edma: Initialize IRQ data before requesting IRQs
A NULL pointer dereference in the Linux kernel DMA engine driver can cause a system crash when handling shared interrupts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89993?
CVE-2026-89993 is a vulnerability in Linux, published on 16 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:
dmaengine: dw-edma: Initialize IRQ data before requesting IRQs
dw_edma_irq_request() passes struct dw_edma_irq to request_irq() before dw_edma_channel_setup() fills the back pointer. A shared interrupt can therefore enter the handler with dw_irq->dw still NULL, leading to a NULL pointer dereference.
Set the back pointer before installing each handler.
Which versions are affected by CVE-2026-89993?
How do I fix CVE-2026-89993?
Apply the vendor's patch.
Is CVE-2026-89993 being exploited?
There is no known exploitation of CVE-2026-89993 in the wild and no public exploit code.
Sources
Also known as AZL-101423, BELL-CVE-2026-89993, DEBIAN-CVE-2026-89993, GHSA-36xx-949x-639g, UBUNTU-CVE-2026-89993.