{"api_version":"1","generated_at":"2026-10-31T01:21:02+00:00","cve":"CVE-2026-99024","urls":{"html":"https://cve.report/CVE-2026-99024","api":"https://cve.report/api/cve/CVE-2026-99024.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99024","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99024"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 13:17:25","updated_at":"2026-10-30 13:21:38"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","name":"https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6","name":"https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df","name":"https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab","name":"https://git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d","name":"https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d","name":"https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4","name":"https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","name":"https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99024","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99024","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 8de131e1a2ab379641bb475f1bcb472a1a1d75df git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 6b21a716ccab7fa42e8dfa3118000bc5274004ab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 262062c01f5a817104c88bf6eacb7c6ffdc7018d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99024","cve":"CVE-2026-99024","epss":"0.001680000","percentile":"0.062150000","score_date":"2026-10-30","updated_at":"2026-10-31 00:01:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8de131e1a2ab379641bb475f1bcb472a1a1d75df","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"6b21a716ccab7fa42e8dfa3118000bc5274004ab","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"262062c01f5a817104c88bf6eacb7c6ffdc7018d","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"8cae1605be8a047ae3a62df07b9474d61462c4f6","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"681adbc9c7a820279582a295e183fa6a1d1b4ec4","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"2f7240f0a6fd83df274fc0a2abf0609b4e6bd388","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"},{"lessThan":"c108feca0a096f8db25d1b69130035025e9e936d","status":"affected","version":"4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/tee/optee/ffa_abi.c","drivers/tee/optee/smc_abi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.12"},{"lessThan":"4.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.273","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.224","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.191","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.57","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.273","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.224","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.191","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.57","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.11","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"4.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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]"}],"providerMetadata":{"dateUpdated":"2026-10-30T12:41:00.882Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"optee: register TEE devices only once fully initialized","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99024","datePublished":"2026-10-23T12:21:08.551Z","dateReserved":"2026-09-25T10:25:14.386Z","dateUpdated":"2026-10-30T12:41:00.882Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 13:17:25","lastModifiedDate":"2026-10-30 13:21:38","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99024","Ordinal":"1","Title":"optee: register TEE devices only once fully initialized","CVE":"CVE-2026-99024","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99024","Ordinal":"1","NoteData":"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]","Type":"Description","Title":"optee: register TEE devices only once fully initialized"}]}}}