CVE-2026-89804
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the drm/nouveau/dmem driver had a mismatched DMA unmap size for large folios. Device-private THP migration maps buffers with page_size() and records that length, but two teardown sites passed a literal PAGE_SIZE to dma_unmap_page(), leaking part of the IOMMU/IOVA mapping for order > 0 folios. The fix uses the saved size.
Risk Assessment
Leaking IOMMU/IOVA mappings can lead to resource exhaustion and system instability, and in extreme cases memory safety issues. Affects systems with NVIDIA GPUs using dmem.
Recommendation
Update the Linux kernel to a version with the drm/nouveau/dmem fix. Monitor IOMMU resource usage on systems with NVIDIA GPUs.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/dmem: fix mismatched DMA unmap size for large folios Device-private THP migration maps migration buffers with page_size() and records that length in dma_info->size. For a compound folio page_size() is PAGE_SIZE << order, but two teardown sites still pass a literal PAGE_SIZE to dma_unmap_page(): - nouveau_dmem_migrate_to_ram() on the success path, and - nouveau_dmem_migrate_copy_one() on the copy-error path. For an order > 0 folio this unmaps less than was mapped, leaking the remainder of the IOMMU/IOVA mapping. The other unmap sites, in nouveau_dmem_migrate_chunk() and nouveau_dmem_evict_chunk(), already use the saved size; use it here too.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

