CVE-2026-93170

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References