{"id":"CVE-2026-99024","summary":"optee: register TEE devices only once fully initialized","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]","modified":"2026-11-01T02:32:52.622616331Z","published":"2026-10-23T12:21:08.551Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99024.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2"},{"fixed":"8de131e1a2ab379641bb475f1bcb472a1a1d75df"},{"fixed":"db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6"},{"fixed":"6b21a716ccab7fa42e8dfa3118000bc5274004ab"},{"fixed":"262062c01f5a817104c88bf6eacb7c6ffdc7018d"},{"fixed":"8cae1605be8a047ae3a62df07b9474d61462c4f6"},{"fixed":"681adbc9c7a820279582a295e183fa6a1d1b4ec4"},{"fixed":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388"},{"fixed":"c108feca0a096f8db25d1b69130035025e9e936d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99024.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","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"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99024.json"}}],"schema_version":"1.9.2"}