CVE-2026-93040
UnknownSummary
In the Linux kernel, the dw-edma dmaengine driver's pause() and resume() read and update channel state without holding vc.lock, while interrupt handlers update the same state under it. This can record a pause request on an already idle channel that no further interrupt will acknowledge, permanently wedging the channel.
Risk Assessment
A wedged DMA channel blocks further operations and cannot be recovered even by reconfiguration, potentially halting critical data transfers.
Recommendation
Update the Linux kernel to a version with the fix that takes vc.lock around the channel state checks and the configured test.
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Original NVD description (English source)
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-state snapshot.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS