optee: register TEE devices only once fully initialized

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99024
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:25 UTC
Updated2026-10-30 13:21:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: optee: register TEE devices only once fully initialized optee_probe() called tee_device_register() on both the client and the supplicant device before the rest of struct optee had been initialized. tee_device_register() calls cdev_device_add(), which does two things at once: it creates /dev/tee0 and /dev/teepriv0, and it links the device into the tee class so that class_find_device() can find it. From that moment on the device is reachable both from user space via tee_open() and from kernel space via tee_client_open_context(). The only gate in teedev_open() is tee_device_get(), which merely checks that teedev->desc is non-NULL, which was already set by tee_device_alloc(). Therefore, there is effectively no gate at all. A context opened in that window can run against a struct optee where - optee->call_queue.mutex is not initialized by optee_cq_init() - optee->supp mutex and completions is not initialized by optee_supp_init() - optee->rpmb_dev_mutex is not initialized yet, - the message argument cache is not initialized by optee_shm_arg_cache_init() - optee->ctx is still NULL Any open session or invoke during this window takes uninitialized mutexes and dereferences a NULL pointer. Fix it by moving both tee_device_register() calls down to the point where all of struct optee is set up. [JW: adding fixes and cc]

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.062150000 (date 2026-10-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 8de131e1a2ab379641bb475f1bcb472a1a1d75df git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6 git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 6b21a716ccab7fa42e8dfa3118000bc5274004ab git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 262062c01f5a817104c88bf6eacb7c6ffdc7018d git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 8cae1605be8a047ae3a62df07b9474d61462c4f6 git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 681adbc9c7a820279582a295e183fa6a1d1b4ec4 git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 2f7240f0a6fd83df274fc0a2abf0609b4e6bd388 git Not specified
CNA Linux Linux affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 c108feca0a096f8db25d1b69130035025e9e936d git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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