CVE-2026-99024

Full vulnerability record from the local CVENow database.

Description

In 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]

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 13:17:25.357000

Last modified

2026-10-30 13:21:38.727000

View original CVE JSON

{
  "id": "CVE-2026-99024",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T13:17:25.357",
  "lastModified": "2026-10-30T13:21:38.727",
  "vulnStatus": "Received",
  "cveTags": [],
  "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": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "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",
          "versions": [
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "8de131e1a2ab379641bb475f1bcb472a1a1d75df",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "6b21a716ccab7fa42e8dfa3118000bc5274004ab",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "262062c01f5a817104c88bf6eacb7c6ffdc7018d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "8cae1605be8a047ae3a62df07b9474d61462c4f6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "681adbc9c7a820279582a295e183fa6a1d1b4ec4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
              "lessThan": "2f7240f0a6fd83df274fc0a2abf0609b4e6bd388",
              "versionType": "git",
              "status": "affected"
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            {
              "version": "4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2",
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              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "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",
          "versions": [
            {
              "version": "4.12",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.12",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.113",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.11",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}