{
  "cveId": "CVE-2026-80633",
  "url": "https://patchblox.com/security/cve/CVE-2026-80633",
  "summary": "CVE-2026-80633 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80633 (version 7.1.5-1), released August 29, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  iommufd: Take dma_resv lock before dma_buf_unpin...",
  "description": "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\u0027s 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\u002B0x62/0x70   RIP: 0010:dma_buf_unpin\u002B0x62/0x70   Call Trace:    \u003CTASK\u003E    dma_buf_unpin\u002B0x62/0x70    iopt_release_pages\u002B0xe4/0x190    iopt_unmap_iova_range\u002B0x1c7/0x290    iopt_unmap_all\u002B0x1a/0x30    iommufd_ioas_destroy\u002B0x1d/0x50    iommufd_fops_release\u002B0x93/0x150    __fput\u002B0xfc/0x2c0    __x64_sys_close\u002B0x3d/0x80    do_syscall_64\u002B0x65/0x180    \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.",
  "published": "2026-08-28T08:16:48Z",
  "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",
  "epss": 0.00165,
  "epssPercentile": 0.0575,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.5-1",
      "fix": "DEBIAN-CVE-2026-80633",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80633",
      "released": "2026-08-29T00:46:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}