{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8c5f9645c3893f0db679d9affe4fe4e665b990dd"
            },
            {
              "fixed": "cc69d0332421fd2943b66dbe5e597bf4fd5af126"
            },
            {
              "fixed": "e745cd2c749e557c14a15ac931761c3f58c24489"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.1.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80633.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Take dma_resv lock before dma_buf_unpin() in release path\n\ndma_buf_unpin() requires the caller to hold the exporter's dma_resv\nlock:\n\n  void dma_buf_unpin(struct dma_buf_attachment *attach)\n  {\n          ...\n          dma_resv_assert_held(dmabuf-\u003eresv);\n          ...\n  }\n\niopt_release_pages() calls dma_buf_unpin() without taking that lock,\nso every iommufd_ioas_destroy()/iommufd_ioas_unmap() that releases\nthe last reference on a DMABUF-backed iopt_pages triggers a WARN.\nThis was hit while running tools/testing/selftests/iommu/iommufd:\n\n  WARNING: drivers/dma-buf/dma-buf.c:1137 at dma_buf_unpin+0x62/0x70\n  RIP: 0010:dma_buf_unpin+0x62/0x70\n  Call Trace:\n   \u003cTASK\u003e\n   dma_buf_unpin+0x62/0x70\n   iopt_release_pages+0xe4/0x190\n   iopt_unmap_iova_range+0x1c7/0x290\n   iopt_unmap_all+0x1a/0x30\n   iommufd_ioas_destroy+0x1d/0x50\n   iommufd_fops_release+0x93/0x150\n   __fput+0xfc/0x2c0\n   __x64_sys_close+0x3d/0x80\n   do_syscall_64+0x65/0x180\n   \u003c/TASK\u003e\n\nTake the dma_resv lock around dma_buf_unpin() in iopt_release_pages(),\nmatching the iopt_map_dmabuf() convention. dma_buf_detach() acquires the\nreservation lock internally, so it must remain outside the locked region.",
  "id": "CVE-2026-80633",
  "modified": "2026-08-30T03:30:40.553484773Z",
  "published": "2026-08-28T06:48:48.372Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80633.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80633"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "iommufd: Take dma_resv lock before dma_buf_unpin() in release path"
}