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CVE-2026-99024

optee: register TEE devices only once fully initialized

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:05:30 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 8de131e1a2ab379641bb475f1bcb472a1a1d75df

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 6b21a716ccab7fa42e8dfa3118000bc5274004ab

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 262062c01f5a817104c88bf6eacb7c6ffdc7018d

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 8cae1605be8a047ae3a62df07b9474d61462c4f6

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 681adbc9c7a820279582a295e183fa6a1d1b4ec4

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before 2f7240f0a6fd83df274fc0a2abf0609b4e6bd388

git versions

4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 → before c108feca0a096f8db25d1b69130035025e9e936d

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.12

unaffected

0 → before 4.12

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.113 → through 6.12.*

semver versions

6.18.57 → through 6.18.*

semver versions

7.2.11 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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]

References

8 sources
git.kernel.org/stable/c/8de131e1a2ab379641bb475f1bcb472a1a1d75df
Source referenceLinux
git.kernel.org/stable/c/db36c37a2c3f13d5fd0f1afd8e2391d6c50793e6
Source referenceLinux
git.kernel.org/stable/c/6b21a716ccab7fa42e8dfa3118000bc5274004ab
Source referenceLinux
git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d
Source referenceLinux
git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6
Source referenceLinux
git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388
Source referenceLinux
git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99024

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 6.12.113

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 6.18.57

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 7.2.11

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.12

Before: 7.3

Applicability preview
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  {
    "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:*:*:*:*:*:*:*:*",
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            "versionEndExcluding": "5.15.224"
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          {
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          {
            "vulnerable": true,
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          },
          {
            "vulnerable": true,
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            "versionStartIncluding": "4.12",
            "versionEndExcluding": "6.18.57"
          },
          {
            "vulnerable": true,
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            "versionStartIncluding": "4.12",
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          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.