{
  "cveId": "CVE-2025-39717",
  "url": "https://patchblox.com/security/cve/CVE-2025-39717",
  "summary": "CVE-2025-39717 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39717 (version 6.16.5-1), released September 5, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  open_tree_attr: do not allow id-mapping changes...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE  As described in commit 7a54947e727b (\u0027Merge patch series \u0022fs: allow changing idmappings\u0022\u0027), open_tree_attr(2) was necessary in order to allow for a detached mount to be created and have its idmappings changed without the risk of any racing threads operating on it. For this reason, mount_setattr(2) still does not allow for id-mappings to be changed.  However, there was a bug in commit 2462651ffa76 (\u0022fs: allow changing idmappings\u0022) which allowed users to bypass this restriction by calling open_tree_attr(2) *without* OPEN_TREE_CLONE.  can_idmap_mount() prevented this bug from allowing an attached mountpoint\u0027s id-mapping from being modified (thanks to an is_anon_ns() check), but this still allows for detached (but visible) mounts to have their be id-mapping changed. This risks the same UAF and locking issues as described in the merge commit, and was likely unintentional.",
  "published": "2025-09-05T18:15:49Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00155,
  "epssPercentile": 0.04671,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.5-1",
      "fix": "DEBIAN-CVE-2025-39717",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39717",
      "released": "2025-09-05T18:15:49Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}