{"id":"CVE-2026-89804","published":"2026-09-16T11:16:45.347","lastModified":"2026-09-16T15:18:10.130","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/dmem: fix mismatched DMA unmap size for large folios\n\nDevice-private THP migration maps migration buffers with page_size()\nand records that length in dma_info->size.  For a compound folio\npage_size() is PAGE_SIZE << order, but two teardown sites still pass a\nliteral PAGE_SIZE to dma_unmap_page():\n\n  - nouveau_dmem_migrate_to_ram() on the success path, and\n  - nouveau_dmem_migrate_copy_one() on the copy-error path.\n\nFor an order > 0 folio this unmaps less than was mapped, leaking the\nremainder of the IOMMU/IOVA mapping.  The other unmap sites, in\nnouveau_dmem_migrate_chunk() and nouveau_dmem_evict_chunk(), already\nuse the saved size; use it here too.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/4deb29b9d33bfdb3de4d2d9944947ecf77221e42","tags":[]},{"url":"https://git.kernel.org/stable/c/caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}