CVE-2023-21056
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 lwis_slc_buffer_free of lwis_device_slc.c, there is a possible memory corruption due to type confusion. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-245300559References: N/A
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 type confusion vulnerability in the lwis_slc_buffer_free function within the Android kernel's LWIS (Light Weight Interface for Scalable) subsystem allows memory corruption during buffer释放 operations. The flaw enables a local attacker with System-level privileges to potentially escalate privileges via memory corruption, without requiring 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 dataall versionsCVSS 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 security patch levelGo to Settings > About Phone > Security Patch Level and verify the date. For CVE-2023-21056, the fix was released in the Android security patch for A-245300559 - check if your patch level is after the date the fix was released in your Android version's security bulletin.Affected if The Security Patch Level is dated before the fix was released for your Android version.
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Verify LWIS kernel subsystem statusCheck if the LWIS driver is loaded or built into the kernel. On a rooted device, run: ls -la /sys/module/lwis/ or check kernel config at /proc/config.gz (if enabled) for CONFIG_LWIS=y or CONFIG_LWIS=m.Affected if The LWIS subsystem is present and the kernel is unpatched.
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Confirm kernel version and sourceRun 'uname -a' to get kernel version, then compare against the specific Android kernel version ranges that contain the vulnerable lwis_slc_buffer_free function. If using a custom or upstream kernel not from Android, verify the commit history for the LWIS buffer release fix.Affected if The kernel version predates the CVE fix or is a custom build without the security patch applied.
Your device is affected if it runs an Android version with a Security Patch Level predating the fix for A-245300559 and has the LWIS kernel subsystem enabled.
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.
From vendor dataApply the Android kernel security patch for A-245300559 once released; until then, minimize exposure by restricting device rooting and ensuring only trusted applications have elevated privileges.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-21056 — 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-2023-21056 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
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