{"id":"CVE-2026-99024","revision":"d31121f7b26e497bb6e76a2d649b25f3","records":[{"revision":"d31121f7b26e497bb6e76a2d649b25f3","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-99024","aliases":[],"title":"optee: register TEE devices only once fully initialized","description":"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]","state":0,"publishedAt":"2026-10-23T12:21:08.551+00:00","modifiedAt":"2026-10-23T12:21:08.551+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/tee/optee/ffa_abi.c\",\n                        \"drivers/tee/optee/smc_abi.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2\",\n                            \"lessThan\": \"262062c01f5a817104c88bf6eacb7c6ffdc7018d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2\",\n                            \"lessThan\": \"8cae1605be8a047ae3a62df07b9474d61462c4f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2\",\n                            \"lessThan\": \"681adbc9c7a820279582a295e183fa6a1d1b4ec4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2\",\n                            \"lessThan\": \"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2\",\n                            \"lessThan\": \"c108feca0a096f8db25d1b69130035025e9e936d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/tee/optee/ffa_abi.c\",\n                        \"drivers/tee/optee/smc_abi.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.11\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d","https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6","https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4","https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99024","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99024","identifiers":["CVE-2026-99024"]},"retained":false,"historicalAffected":[]}],"coverage":[]}