CVE-2026-93040

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: dw-edma: Serialize channel state checks

pause() and resume() read and update channel state without holding vc.lock,

while the interrupt handlers update the same state under it. Take the same

lock around those state checks so that request, status, and configured stay

consistent.

For example, pause() can observe EDMA_ST_BUSY right before the interrupt

handler completes the final descriptor and moves the channel to

EDMA_ST_IDLE, and then record EDMA_REQ_PAUSE on an already idle channel. No

further interrupt will acknowledge the request, and since issue_pending()

requires EDMA_REQ_NONE, the channel is wedged for good: terminate_all()

leaves the stale request behind, so even reconfiguring the channel does not

recover it.

issue_pending() already runs under vc.lock, but it tests configured before

taking it. Move that test under the lock as well, so configured, request,

and status are evaluated as one channel-st

/// 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