{
  "cveId": "CVE-2025-40212",
  "url": "https://patchblox.com/security/cve/CVE-2025-40212",
  "summary": "CVE-2025-40212 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2025-40212, released November 24, 2025. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix refcount leak in nfsd_set_fh_dentry()...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix refcount leak in nfsd_set_fh_dentry()  nfsd exports a \u0022pseudo root filesystem\u0022 which is used by NFSv4 to find the various exported filesystems using LOOKUP requests from a known root filehandle.  NFSv3 uses the MOUNT protocol to find those exported filesystems and so is not given access to the pseudo root filesystem.  If a v3 (or v2) client uses a filehandle from that filesystem, nfsd_set_fh_dentry() will report an error, but still stores the export in \u0022struct svc_fh\u0022 even though it also drops the reference (exp_put()). This means that when fh_put() is called an extra reference will be dropped which can lead to use-after-free and possible denial of service.  Normal NFS usage will not provide a pseudo-root filehandle to a v3 client.  This bug can only be triggered by the client synthesising an incorrect filehandle.  To fix this we move the assignments to the svc_fh later, after all possible error cases have been detected.",
  "published": "2025-11-24T13:16:02Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0043,
  "epssPercentile": 0.37462,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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