CVE-2021-0611
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 m4u, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS05403499; Issue ID: ALPS05425810.
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 · high confidenceA use-after-free vulnerability exists in the m4u (Memory Management Unit) component where memory is accessed after being freed, causing memory corruption. This allows a local attacker with System execution privileges to escalate privileges to root. No user interaction is required for exploitation.
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= 10.0= 11.0CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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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Verify Android versionRun 'getprop ro.build.version.release' or check Settings > About Phone > Android versionAffected if The version is exactly 10.0 or 11.0 (these are the only affected versions listed)
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Identify m4u component presenceCheck for m4u kernel module or device node - look in /sys/module/ for 'm4u' or check /dev/ for m4u-related device filesAffected if The m4u component is present and loaded on the device
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Check for patch ALPS05403499Run 'getprop' to check build properties or inspect vendor/kernel patches - grep for 'ALPS05403499' in system or vendor partitions if accessibleAffected if The patch ALPS05403499 is NOT applied (vulnerable) or cannot be verified as applied
The device is affected if it runs Android 10.0 or 11.0, contains the m4u component, and lacks the ALPS05403499 patch. The attacker must already have System-level execution privileges to exploit this use-after-free vulnerability.
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 patch ALPS05403499 to address the use-after-free in the m4u component. This is a vendor-supplied fix that should be integrated into the affected Android/system image.
- 1. Obtain the Mediatek patch ALPS05403499 which addresses the use-after-free vulnerability in the m4u driver (Issue ID ALPS05425810)
- 2. Contact Mediatek directly through your device OEM or Mediatek's corporate channels to receive the patched m4u driver binary/module
- 3. Apply the patch through your Android device's vendor-specific update mechanism, as this is a Mediatek GPU/memory management driver issue not covered by standard AOSP patches
- 4. Ensure the device receives the corresponding Android Security Patch Level that includes this fix; check the Android Security Bulletin for the month the fix was released
- 5. After patching, verify the m4u driver version includes the fix by checking /vendor or /system/vendor driver versions
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,864.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-0611 — 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-2021-0611 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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