CVE-2026-93042
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In the Linux kernel, the dmaengine dw-edma driver called vchan_cookie_complete() on a deferred STOP, scheduling a callback for the active descriptor and leaving other descriptors queued. A late callback after dmaengine_terminate_sync() could dereference freed client state, and leftover descriptors could restart into reused buffers. The fix moves all issued and submitted descriptors to the terminated list without scheduling callbacks.
Risk Assessment
Dereferencing freed client state (use-after-free) and restarting into reused buffers can lead to data corruption, kernel crashes, or potentially arbitrary code execution.
Recommendation
Update the Linux kernel to a version containing the fix for the dmaengine dw-edma driver; until patched, avoid using this driver in high-security environments.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS