tee: fix register_shm_helper()

{
  "id": "2bd04cf1311b873c086f722170704f43b8967bd43b4528cd47997d63aae8348f",
  "url": "https://osv.dev/vulnerability/CVE-2025-40031",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tee: fix register_shm_helper()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tee: fix register_shm_helper() In register_shm_helper(), fix incorrect error handling for a call to iov_iter_extract_pages(). A case is missing for when iov_iter_extract_pages() only got some pages and return a number larger than 0, but not the requested amount. This fixes a possible NULL pointer dereference following a bad input from ioctl(TEE_IOC_SHM_REGISTER) where parts of the buffer isn't mapped.",
    "evidence": "osv:CVE-2025-40031",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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            "value": "6.12.53",
            "evidence": "/affected/1/ranges"
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            "value": "6.17.3",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
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              "type": "ECOSYSTEM",
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            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40031.json"
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      ],
      "modified": "2026-10-28T02:30:48.673594188Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6a7874ab814ce12003c46a92f7afc9b035c8e8e9",
        "https://git.kernel.org/stable/c/9338093db954918558677a468d32e77041c65167",
        "https://git.kernel.org/stable/c/d5cf5b37064b1699d946e8b7ab4ac7d7d101814c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40031.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40031",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 517101,
  "published_at": "2025-10-28T11:48:13.644+00:00"
}