CVE-2026-72474
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, the dma-axi-dmac driver has an issue with DMA descriptor management. Using dma_alloc_coherent() may cause memory remapping (vmalloc) on architectures like Microblaze or arm64, leading to a BUG() when calling dma_free_coherent() from softirq context. The fix uses a DMA pool to manage descriptors, avoiding direct dma_free_coherent() calls in interrupt context.
Risk Assessment
The vulnerability can cause a kernel BUG in interrupt context, leading to system unavailability or data corruption.
Recommendation
Apply the kernel patch that uses a DMA pool for descriptor management. Update the system to a kernel version with the fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor For architectures like Microblaze or arm64 (where this IP is used), DMA_DIRECT_REMAP is set which means that dma_alloc_coherent() might remap (and hence vmalloc()) some memory. This became visible in a design where dma_direct_use_pool() is not possible. With the above, when calling dma_free_coherent(), vunmap() would be called from softirq context and thus leading to a BUG(). To fix it, use a dma pool that is allocated in .device_alloc_chan_resources() and allocate blocks from it. The key point is that now dma_pool_free() is used in axi_dmac_free_desc() to free the blocks and that just frees the blocks from the pool in the sense they can be used again. In other words, no actual call to dma_free_coherent() happens. That only happens when destroying the pool in axi_dmac_free_chan_resources() which does not happen in any interrupt context.