CVE-2026-93170
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel's dmaengine: xilinx_dma driver, a race condition existed in the AXIDMA and MCDMA interrupt handlers. The channel could be incorrectly marked idle and start spurious transfers while descriptors were still being processed, leading to descriptor corruption or missed completions.
Risk Assessment
The race may cause DMA descriptor corruption or lost transfer completion events, leading to system instability or data errors. Affects systems with Xilinx DMA controllers.
Recommendation
Update the Linux kernel to a version with the fix that marks the channel idle only when the active list is empty. Monitor systems with Xilinx DMA controllers for transfer errors.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dmaengine: xilinx_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers Fix a race condition in AXIDMA and MCDMA irq handlers where the channel could be incorrectly marked as idle and attempt spurious transfers when descriptors are still being processed. The issue occurs when: 1. Multiple descriptors are queued and active. 2. An interrupt fires after completing some descriptors. 3. xilinx_dma_complete_descriptor() moves completed descriptors to done_list. 4. Channel is marked idle and start_transfer() is called even though active_list still contains unprocessed descriptors. 5. This leads to premature transfer attempts and potential descriptor corruption or missed completions. Only mark the channel as idle and start new transfers when the active list is actually empty, ensuring proper channel state management and avoiding spurious transfer attempts.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS