CVE-2025-20888
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 · uneditedOut-of-bounds write in handling the block size for smp4vtd in libsthmbc.so prior to SMR Jan-2025 Release 1 allows local attackers to execute arbitrary code with privilege. User interaction is required for triggering this vulnerability.
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 confidenceOut-of-bounds write vulnerability in libsthmbc.so (thumbnail controller library) in the block size handling code for smp4vtd prior to SMR Jan-2025 Release 1. Allows local privilege escalation via arbitrary code execution, but requires user interaction to trigger.
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= 12.0= 13.0= 14.0CVSS 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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 versionOpen Settings > About Phone > Android version, or run 'getprop ro.build.version.release' via ADB shellAffected if Version is 12.0, 13.0, or 14.0 (exact match to the affected versions listed)
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Locate libsthmbc.so libraryRun 'find / -name libsthmbc.so 2>/dev/null' or check common library paths like /system/lib64/ via ADB shellAffected if libsthmbc.so file exists on the device, indicating the thumbnail controller library is present
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Verify smp4vtd daemon is runningRun 'ps -A | grep smp4vtd' via ADB shell to list the processAffected if smp4vtd process is actively running, meaning the vulnerable block size handling code path could be reached
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Check library file timestampRun 'ls -la /path/to/libsthmbc.so' to inspect file modification date, or use 'stat /path/to/libsthmbc.so'Affected if Library was built or modified before the SMR Jan-2025 Release 1 patch date (indicating unpatched version)
Environment is affected if running Android 12.0, 13.0, or 14.0 with libsthmbc.so present and smp4vtd daemon running, and the library predates the Jan-2025 patch.
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 · scopedUpdate to SMR Jan-2025 Release 1 or later to obtain the patched libsthmbc.so with proper bounds checking in the smp4vtd block size handler.
Samsung SMR Jan-2025 Release 1 (or later monthly security update)
- Check current Android patch level by going to Settings > About Phone > Software Information > Security patch level
- Ensure your device receives the Samsung SMR (Security Monthly Release) for January 2025 or later
- Go to Settings > Software Update > Download and install the latest Samsung update
- After installation, verify the Security patch level shows January 2025 Release 1 or later under Settings > About Phone > Software Information
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-20888 — 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-2025-20888 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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