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optee: register TEE devices only once fully initialized

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: optee: register TEE devices only once fully initialized optee_probe() called tee_device_register() on both the client and the supplicant device before the rest of struct optee had been initialized. tee_device_register() calls cdev_device_add(), which does two things at once: it creates /dev/tee0 and /dev/teepriv0, and it links the device into the tee class so that class_find_device() can find it. From that moment on the device is reachable both from user space via tee_open() and from kernel space via tee_client_open_context(). The only gate in teedev_open() is tee_device_get(), which merely checks that teedev->desc is non-NULL, which was already set by tee_device_alloc(). Therefore, there is effectively no gate at all. A context opened in that window can run against a struct optee where - optee->call_queue.mutex is not initialized by optee_cq_init() - optee->supp mutex and completions is not initialized by optee_supp_init() - optee->rpmb_dev_mutex is not initialized yet, - the message argument cache is not initialized by optee_shm_arg_cache_init() - optee->ctx is still NULL Any open session or invoke during this window takes uninitialized mutexes and dereferences a NULL pointer. Fix it by moving both tee_device_register() calls down to the point where all of struct optee is set up. [JW: adding fixes and cc]

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.273, 5.15.224, 6.1.191, 6.12.113, 6.18.57, 6.6.160, 7.2.11
CVEs
CVE-2026-99024
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 19:11 UTC · Revision 1

Source evidence

optee: register TEE devices only once fully initialized

core-osv · Original source

Published 23 Oct 2026, 12:21 UTC

In the Linux kernel, the following vulnerability has been resolved: optee: register TEE devices only once fully initialized optee_probe() called tee_device_register() on both the client and the supplicant device before the rest of struct optee had been initialized. tee_device_register() calls cdev_device_add(), which does two things at once: it creates /dev/tee0 and /dev/teepriv0, and it links the device into the tee class so that class_find_device() can find it. From that moment on the device is reachable both from user space via tee_open() and from kernel space via tee_client_open_context(). The only gate in teedev_open() is tee_device_get(), which merely checks that teedev->desc is non-NULL, which was already set by tee_device_alloc(). Therefore, there is effectively no gate at all. A context opened in that window can run against a struct optee where - optee->call_queue.mutex is not initialized by optee_cq_init() - optee->supp mutex and completions is not initialized by optee_supp_init() - optee->rpmb_dev_mutex is not initialized yet, - the message argument cache is not initialized by optee_shm_arg_cache_init() - optee->ctx is still NULL Any open session or invoke during this window takes uninitialized mutexes and dereferences a NULL pointer. Fix it by moving both tee_device_register() calls down to the point where all of struct optee is set up. [JW: adding fixes and cc]

osv:CVE-2026-99024

Kernel

Fixed versions: 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11

Complete source record
{
  "id": "cd44ad12d992a892a0ab39cb7c2d8c43781c57d0a5bc37887232922295b520d4",
  "url": "https://osv.dev/vulnerability/CVE-2026-99024",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "optee: register TEE devices only once fully initialized",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: optee: register TEE devices only once fully initialized optee_probe() called tee_device_register() on both the client and the supplicant device before the rest of struct optee had been initialized. tee_device_register() calls cdev_device_add(), which does two things at once: it creates /dev/tee0 and /dev/teepriv0, and it links the device into the tee class so that class_find_device() can find it. From that moment on the device is reachable both from user space via tee_open() and from kernel space via tee_client_open_context(). The only gate in teedev_open() is tee_device_get(), which merely checks that teedev->desc is non-NULL, which was already set by tee_device_alloc(). Therefore, there is effectively no gate at all. A context opened in that window can run against a struct optee where - optee->call_queue.mutex is not initialized by optee_cq_init() - optee->supp mutex and completions is not initialized by optee_supp_init() - optee->rpmb_dev_mutex is not initialized yet, - the message argument cache is not initialized by optee_shm_arg_cache_init() - optee->ctx is still NULL Any open session or invoke during this window takes uninitialized mutexes and dereferences a NULL pointer. Fix it by moving both tee_device_register() calls down to the point where all of struct optee is set up. [JW: adding fixes and cc]",
    "evidence": "osv:CVE-2026-99024",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.273",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "affected": [
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              "type": "ECOSYSTEM",
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                  "introduced": "4.12.0"
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                {
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              ]
            },
            {
              "type": "ECOSYSTEM",
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            {
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          "package": {
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          }
        }
      ],
      "modified": "2026-11-01T02:30:43.515540854Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d",
        "https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388",
        "https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4",
        "https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab",
        "https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6",
        "https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df",
        "https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d",
        "https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99024.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-99024",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99024.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-99024",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498637,
  "published_at": "2026-10-23T12:21:08.551+00:00"
}