CVE-2026-93042

/// Technical description

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

dmaengine: dw-edma: Terminate all descriptors without callbacks

The DMA Engine client documentation says in the "Terminate APIs" section

of Documentation/driver-api/dmaengine/client.rst:

"No callback functions will be called for any incomplete transfers."

dw-edma instead calls vchan_cookie_complete() when a deferred STOP reaches

the interrupt handler. This schedules a callback for the active descriptor

and leaves other issued or submitted descriptors queued. A late callback

after dmaengine_terminate_sync() can dereference client state that has

already been freed, while leftover descriptors may later restart into

reused buffers or leak.

Move all issued and submitted descriptors to the terminated list whenever

termination completes. For a pending STOP, do this from both the DONE and

ABORT paths. Complete their cookies in order without scheduling callbacks.

A STOP can remain pending until the running transfer raises

/// 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