{"id":"CVE-2026-89804","title":"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_in…","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 with page_size()\nand records that length in dma_in…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= c3228747107705d47c7e9a03598a434a0380cb73 < 4deb29b9d33bfdb3de4d2d9944947ecf77221e42","Linux >= c3228747107705d47c7e9a03598a434a0380cb73 < caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f","Linux 6.19"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:10.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89804","references":[{"url":"https://git.kernel.org/stable/c/4deb29b9d33bfdb3de4d2d9944947ecf77221e42","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.007Z","epss":0.00154,"epssPercentile":0.04918,"slug":"CVE-2026-89804","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205251,"id":"CVE-2026-89804","ts":1789570705933,"field":"cvss","old":null,"new":"8.8"},{"seq":205250,"id":"CVE-2026-89804","ts":1789570705933,"field":"severity","old":"none","new":"high"}]}