{"id":"CVE-2026-99024","state":"PUBLISHED","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]","publishedAt":"2026-10-23T12:21:08.551Z","updatedAt":"2026-10-30T12:41:00.882Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"8de131e1a2ab379641bb475f1bcb472a1a1d75df","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"6b21a716ccab7fa42e8dfa3118000bc5274004ab","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"262062c01f5a817104c88bf6eacb7c6ffdc7018d","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"8cae1605be8a047ae3a62df07b9474d61462c4f6","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"681adbc9c7a820279582a295e183fa6a1d1b4ec4","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"c108feca0a096f8db25d1b69130035025e9e936d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"]}],"references":["https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df","https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab","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"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99024.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99024","state":"PUBLISHED","datePublished":"2026-10-23T12:21:08.551Z","dateUpdated":"2026-10-30T12:41:00.882Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.386Z"},"containers":{"cna":{"title":"optee: register TEE devices only once fully initialized","descriptions":[{"lang":"en","value":"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]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"8de131e1a2ab379641bb475f1bcb472a1a1d75df","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"6b21a716ccab7fa42e8dfa3118000bc5274004ab","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"262062c01f5a817104c88bf6eacb7c6ffdc7018d","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"8cae1605be8a047ae3a62df07b9474d61462c4f6","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"681adbc9c7a820279582a295e183fa6a1d1b4ec4","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","versionType":"git"},{"version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","status":"affected","lessThan":"c108feca0a096f8db25d1b69130035025e9e936d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df"},{"url":"https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6"},{"url":"https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab"},{"url":"https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d"},{"url":"https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6"},{"url":"https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4"},{"url":"https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388"},{"url":"https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:41:00.882Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}