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 an
interrupt. Make device_synchronize() wait for such a pending STOP to
complete before releasing terminated descriptors. Reuse it from
free_chan_resources(), then release the remaining virt-dma resources.
Sleep instead of busy-polling while waiting, and warn if the existing
timeout expires.
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 an
interrupt. Make device_synchronize() wait for such a pending STOP to
complete before releasing terminated descriptors. Reuse it from
free_chan_resources(), then release the remaining virt-dma resources.
Sleep instead of busy-polling while waiting, and warn if the existing
timeout expires.
Metrics
Affected Vendors & Products
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 an interrupt. Make device_synchronize() wait for such a pending STOP to complete before releasing terminated descriptors. Reuse it from free_chan_resources(), then release the remaining virt-dma resources. Sleep instead of busy-polling while waiting, and warn if the existing timeout expires. | |
| Title | dmaengine: dw-edma: Terminate all descriptors without callbacks | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:10:34.911Z
Reserved: 2026-09-17T15:57:05.657Z
Link: CVE-2026-93042
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:17:57.420
Modified: 2026-09-17T17:17:57.420
Link: CVE-2026-93042
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.