tee: optee: Fix supplicant wait loop

{
  "id": "87074fbcf215dd2f5b6fe94787a1fe6ffd70576297b6dd3aa8e7145a1fa6bacf",
  "url": "https://osv.dev/vulnerability/CVE-2025-21871",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tee: optee: Fix supplicant wait loop",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix supplicant wait loop OP-TEE supplicant is a user-space daemon and it's possible for it be hung or crashed or killed in the middle of processing an OP-TEE RPC call. It becomes more complicated when there is incorrect shutdown ordering of the supplicant process vs the OP-TEE client application which can eventually lead to system hang-up waiting for the closure of the client application. Allow the client process waiting in kernel for supplicant response to be killed rather than indefinitely waiting in an unkillable state. Also, a normal uninterruptible wait should not have resulted in the hung-task watchdog getting triggered, but the endless loop would. This fixes issues observed during system reboot/shutdown when supplicant got hung for some reason or gets crashed/killed which lead to client getting hung in an unkillable state. It in turn lead to system being in hung up state requiring hard power off/on to recover.",
    "evidence": "osv:CVE-2025-21871",
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    "severity": "unknown",
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      "modified": "2026-10-28T02:30:31.013635877Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0180cf0373f84fff61b16f8c062553a13dd7cfca",
        "https://git.kernel.org/stable/c/21234efe2a8474a6d2d01ea9573319de7858ce44",
        "https://git.kernel.org/stable/c/3eb4911364c764572e9db4ab900a57689a54e8ce",
        "https://git.kernel.org/stable/c/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612",
        "https://git.kernel.org/stable/c/c0a9a948159153be145f9471435695373904ee6d",
        "https://git.kernel.org/stable/c/d61cc1a435e6894bfb0dd3370c6f765d2d12825d",
        "https://git.kernel.org/stable/c/ec18520f5edc20a00c34a8c9fdd6507c355e880f",
        "https://git.kernel.org/stable/c/fd9d2d6124c293e40797a080adf8a9c237efd8b8",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21871.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21871",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497872,
  "published_at": "2025-03-27T13:38:23.461+00:00"
}