CVE-2022-21774
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn TEEI driver, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06641447; Issue ID: ALPS06641447.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA race condition in the TEEI (Trusted Execution Environment Interface) driver leads to a use-after-free vulnerability. An attacker with System-level privileges can exploit this to escalate to full local privilege escalation without any user interaction.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 11.0= 12.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Android OS versionGo to Settings > About Phone > Build Number or run 'getprop ro.build.version.release' via ADB shellAffected if Version is 11.0 or 12.0 exactly
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Verify TEEI driver presenceCheck for /dev/teei_* device nodes via 'ls -la /dev/teei*' in ADB shell or search kernel config for CONFIG_TEEIAffected if TEEI driver device nodes or kernel config exist on the device
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Confirm TEEI driver is loadedRun 'cat /proc/modules | grep teei' or check 'lsmod' output in ADB shell to see if TEEI module is activeAffected if TEEI driver module is loaded into memory
Device is affected if running Android 11.0 or 12.0 with the TEEI driver present and loaded, as the race condition and use-after-free exist in this specific configuration.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedApply vendor patch ALPS06641447 which addresses the race condition and use-after-free in the TEEI driver. Ensure proper synchronization primitives are implemented to prevent concurrent access to the freed memory.
- Contact MediaTek (corp.mediatek.com) or your device OEM to obtain the security patch ALPS06641447 for the TEEI driver vulnerability
- Apply the vendor-provided patch to address the race condition (CVE-2022-21774) in the TEEI driver
- Verify the patch has been successfully applied by checking the Android security patch level in Settings > About Phone > Security Patch Level
- Ensure the device is running Android security patch level dated February 2022 or later, which includes the fix for this vulnerability
- Reboot the device after patch installation to ensure all TEEI driver components are properly loaded
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing8.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,472.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-21774 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-21774 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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