{"id":"CVE-2026-89804","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89804","summary":"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…","details":"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.","published":"2026-09-16T11:16:45.347","modified":"2026-09-16T11:16:45.347","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4deb29b9d33bfdb3de4d2d9944947ecf77221e42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T11:16:45.347"}}