CVE-2026-89594 hsi: omap_ssi_core: fix missing DMA mask setup for SSI controller device
Missing DMA mask initialization in the OMAP SSI driver can cause kernel crashes during DMA operations, leading to denial of service.
- 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-2026-89594?
CVE-2026-89594 is a high-severity vulnerability in Linux, published on 11 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:
hsi: omap_ssi_core: fix missing DMA mask setup for SSI controller device
The OMAP SSI driver uses a synthetic HSI controller device allocated via hsi_alloc_controller(), which does not go through the normal OF/platform device initialization path.
As a result, the embedded struct device does not have a DMA mask initialized by default.
After recent DMA API hardening changes, dma_map_sg() and related helpers now require a valid dma_mask to be present, otherwise the driver may crash or trigger warnings when attempting DMA mapping operations.
Fix this by explicitly initializing the DMA mask for the SSI controller device and setting a 32-bit DMA mask, which matches the hardware capabilities.
Which versions are affected by CVE-2026-89594?
How do I fix CVE-2026-89594?
Apply the vendor's patch.
Is CVE-2026-89594 being exploited?
There is no known exploitation of CVE-2026-89594 in the wild and no public exploit code.
Sources
Also known as AZL-100808, BELL-CVE-2026-89594, DEBIAN-CVE-2026-89594, GHSA-2c7x-rwh5-mhqm, UBUNTU-CVE-2026-89594.