CVE-2026-63929
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
A memory leak was discovered in the Linux kernel's IIO (Industrial I/O) subsystem during DMA buffer enqueue. The iio_buffer_enqueue_dmabuf() function failed to release a reference to the struct iio_dma_fence object, causing a permanent leak of 104 bytes per enqueue operation.
Risk Assessment
The memory leak can exhaust available kernel memory, leading to system performance degradation and potentially causing a kernel panic or denial of service (DoS).
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit 'iio: buffer: Fix DMA fence leak in iio_buffer_enqueue_dmabuf()'). If an update is not possible, restrict the use of IIO interfaces with DMA buffering.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Fix DMA fence leak in iio_buffer_enqueue_dmabuf() iio_buffer_enqueue_dmabuf() allocates a struct iio_dma_fence (104 bytes, kmalloc-128) via kmalloc_obj()+dma_fence_init(), which sets the initial kref to 1. It then calls dma_resv_add_fence() which takes a second reference (kref=2), and stores a raw pointer in block->fence. On the success path the function returns without calling dma_fence_put() to release the initial reference, so every buffer enqueue permanently leaks one kmalloc-128 allocation. The iio_buffer_cleanup() work item only releases the temporary reference taken during completion signalling by iio_buffer_signal_dmabuf_done(); the initial reference from dma_fence_init() is never released. With four iio_rwdev instances at 240kHz and 512 samples per buffer, this produces ~1875 kmalloc-128 allocations per second matching the observed slab growth exactly. A test with ftrace confirmed that the dma_fence_destroy event was never triggered. Fix by calling dma_fence_put() after dma_resv_add_fence(), transferring ownership of the fence to the DMA reservation object. The DMA fence then gets properly discarded after being signalled.