CVE-2026-90387
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted pool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the atomic pool uses remapped virtual addresses that differ from direct-map addresses. swiotlb_init_io_tlb_pool() reconstructs the virtual address from the physical address, storing the wrong address in pool->vaddr for atomic-pool allocations, causing swiotlb_free_tlb() to fail.
Risk Assessment
A memory free error may lead to memory leaks or kernel corruption. Systems with CONFIG_DMA_DIRECT_REMAP and dynamic swiotlb pools are affected.
Recommendation
Update the Linux kernel to a version with the fix that passes the virtual address from the allocation path to swiotlb_init_io_tlb_pool(). Monitor kernel logs for swiotlb errors.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: swiotlb: Preserve allocation virtual address for dynamic pools swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted pool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the atomic pool is backed by remapped virtual addresses, which are not the same as the direct-map addresses returned by phys_to_virt(). swiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address from the physical start address. For atomic-pool backed allocations this stores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes that address to dma_free_from_pool(), which will fail to recognize the chunk Pass the virtual address returned by the allocation path into swiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This keeps the pool free path using the same virtual address as the allocator.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS