{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  iommufd: Take dma_resv lock before dma_buf_unpin() in release path  dma_buf_unpin() requires the caller to hold the exporter's dma_resv lock:    void dma_buf_unpin(struct dma_buf_attachment *attach)   {           ...           dma_resv_assert_held(dmabuf-\u003eresv);           ...   }  iopt_release_pages() calls dma_buf_unpin() without taking that lock, so every iommufd_ioas_destroy()/iommufd_ioas_unmap() that releases the last reference on a DMABUF-backed iopt_pages triggers a WARN. This was hit while running tools/testing/selftests/iommu/iommufd:    WARNING: drivers/dma-buf/dma-buf.c:1137 at dma_buf_unpin+0x62/0x70   RIP: 0010:dma_buf_unpin+0x62/0x70   Call Trace:    \u003cTASK\u003e    dma_buf_unpin+0x62/0x70    iopt_release_pages+0xe4/0x190    iopt_unmap_iova_range+0x1c7/0x290    iopt_unmap_all+0x1a/0x30    iommufd_ioas_destroy+0x1d/0x50    iommufd_fops_release+0x93/0x150    __fput+0xfc/0x2c0    __x64_sys_close+0x3d/0x80    do_syscall_64+0x65/0x180    \u003c/TASK\u003e  Take the dma_resv lock around dma_buf_unpin() in iopt_release_pages(), matching the iopt_map_dmabuf() convention. dma_buf_detach() acquires the reservation lock internally, so it must remain outside the locked region.",
  "id": "DEBIAN-CVE-2026-80633",
  "modified": "2026-09-14T16:47:41.009114533Z",
  "published": "2026-08-28T08:16:48.200Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80633"
    }
  ],
  "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-2026-80633"
  ]
}