{"schema":"threatline.record/2","record":{"id":"CVE-2026-99024","aliases":[],"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->desc 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->call_queue.mutex is not initialized by optee_cq_init()\n  - optee->supp mutex and completions is not initialized by\n    optee_supp_init()\n  - optee->rpmb_dev_mutex is not initialized yet,\n  - the message argument cache is not initialized by\n    optee_shm_arg_cache_init()\n  - optee->ctx 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]","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","lessThan":"262062c01f5a817104c88bf6eacb7c6ffdc7018d","status":"affected","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","lessThan":"8cae1605be8a047ae3a62df07b9474d61462c4f6","status":"affected","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","lessThan":"681adbc9c7a820279582a295e183fa6a1d1b4ec4","status":"affected","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","lessThan":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","status":"affected","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","lessThan":"c108feca0a096f8db25d1b69130035025e9e936d","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.12","status":"affected"},{"version":"0","lessThan":"4.12","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"262062c01f5a817104c88bf6eacb7c6ffdc7018d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"8cae1605be8a047ae3a62df07b9474d61462c4f6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"681adbc9c7a820279582a295e183fa6a1d1b4ec4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","source_modified_at":"2026-10-23T12:21:08.551Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:21:08.551Z","modified_at":"2026-10-23T12:21:08.551Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:21:08.551Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:21:08.551Z","content_hash":"65976048b31301e6ff8cc8d210f7a6e8fd6f54134dfd888c388790f5e73c087d"}}