{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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-\u003esize.  For a compound folio page_size() is PAGE_SIZE \u003c\u003c 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 \u003e 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.",
  "id": "DEBIAN-CVE-2026-89804",
  "modified": "2026-09-17T04:47:39.406293682Z",
  "published": "2026-09-16T11:16:45.347Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89804"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89804"
  ]
}