{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2"
            },
            {
              "fixed": "8de131e1a2ab379641bb475f1bcb472a1a1d75df"
            },
            {
              "fixed": "db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6"
            },
            {
              "fixed": "6b21a716ccab7fa42e8dfa3118000bc5274004ab"
            },
            {
              "fixed": "262062c01f5a817104c88bf6eacb7c6ffdc7018d"
            },
            {
              "fixed": "8cae1605be8a047ae3a62df07b9474d61462c4f6"
            },
            {
              "fixed": "681adbc9c7a820279582a295e183fa6a1d1b4ec4"
            },
            {
              "fixed": "2f7240f0a6fd83df274fc0a2abf0609b4e6bd388"
            },
            {
              "fixed": "c108feca0a096f8db25d1b69130035025e9e936d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.12.0"
            },
            {
              "fixed": "5.10.273"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.160"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99024.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\noptee: register TEE devices only once fully initialized\n\noptee_probe() called tee_device_register() on both the client and the\nsupplicant device before the rest of struct optee had been initialized.\n\ntee_device_register() calls cdev_device_add(), which does two things at\nonce: it creates /dev/tee0 and /dev/teepriv0, and it links the device\ninto the tee class so that class_find_device() can find it. From that\nmoment on the device is reachable both from user space via tee_open()\nand from kernel space via tee_client_open_context(). The only gate in\nteedev_open() is tee_device_get(), which merely checks that\nteedev-\u003edesc is non-NULL, which was already set by tee_device_alloc().\nTherefore, there is effectively no gate at all.\n\nA context opened in that window can run against a struct optee where\n\n  - optee-\u003ecall_queue.mutex is not initialized by optee_cq_init()\n  - optee-\u003esupp mutex and completions is not initialized by\n    optee_supp_init()\n  - optee-\u003erpmb_dev_mutex is not initialized yet,\n  - the message argument cache is not initialized by\n    optee_shm_arg_cache_init()\n  - optee-\u003ectx is still NULL\n\nAny open session or invoke during this window takes uninitialized\nmutexes and dereferences a NULL pointer.\n\nFix it by moving both tee_device_register() calls down to the point\nwhere all of struct optee is set up.\n\n[JW: adding fixes and cc]",
  "id": "CVE-2026-99024",
  "modified": "2026-11-01T02:30:43.515540854Z",
  "published": "2026-10-23T12:21:08.551Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99024.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99024"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "summary": "optee: register TEE devices only once fully initialized"
}