CVE-2026-93170 dmaengine: xilinx_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers
A race condition in Xilinx DMA drivers allows premature transfer attempts, potentially causing descriptor corruption or 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-2026-93170?
CVE-2026-93170 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:
dmaengine: xilinx_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers
Fix a race condition in AXIDMA and MCDMA irq handlers where the channel could be incorrectly marked as idle and attempt spurious transfers when descriptors are still being processed.
The issue occurs when: 1. Multiple descriptors are queued and active. 2. An interrupt fires after completing some descriptors. 3. xilinx_dma_complete_descriptor() moves completed descriptors to done_list. 4. Channel is marked idle and start_transfer() is called even though active_list still contains unprocessed descriptors. 5. This leads to premature transfer attempts and potential descriptor corruption or missed completions.
Only mark the channel as idle and start new transfers when the active list is actually empty, ensuring proper channel state management and avoiding spurious transfer attempts.
Which versions are affected by CVE-2026-93170?
How do I fix CVE-2026-93170?
Apply the vendor's patch.
Is CVE-2026-93170 being exploited?
There is no known exploitation of CVE-2026-93170 in the wild and no public exploit code.
Sources
Also known as AZL-103028, BELL-CVE-2026-93170, DEBIAN-CVE-2026-93170, GHSA-mc6p-4g8q-qv3v, UBUNTU-CVE-2026-93170.