{
  "cveId": "CVE-2026-99024",
  "url": "https://patchblox.com/security/cve/CVE-2026-99024",
  "summary": "CVE-2026-99024 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99024, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "optee: register TEE devices only once fully initialized",
  "description": "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-\u003Edesc 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-\u003Ecall_queue.mutex is not initialized by optee_cq_init()   - optee-\u003Esupp mutex and completions is not initialized by     optee_supp_init()   - optee-\u003Erpmb_dev_mutex is not initialized yet,   - the message argument cache is not initialized by     optee_shm_arg_cache_init()   - optee-\u003Ectx 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]",
  "published": "2026-10-23T13:17:25Z",
  "severity": "Moderate",
  "cvss": 5.3,
  "epss": 0.00177,
  "epssPercentile": 0.0733,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99024",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-99024",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99024",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.11-1",
      "fix": "DEBIAN-CVE-2026-99024",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99024",
      "released": "2026-10-24T13:25:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}