CVE-2025-21469
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 · uneditedMemory corruption while processing image encoding, when input buffer length is 0 in IOCTL call.
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 confidenceMemory corruption vulnerability in image encoding processing that occurs when an IOCTL call is made with a zero-length input buffer. The lack of proper validation of the buffer length parameter before processing leads to memory corruption, which can be exploited for local privilege escalation or denial of service.
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 versionsall versionsall versionsall versionsall versionsall versionsall versionsall 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
- 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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Identify the Qualcomm firmware componentCheck system information or firmware inventory to determine if the device runs any Qualcomm Fastconnect (6700/6900/7800), Qcm (5430/6490), Qcs (5430/6490), or Video Collaboration Vc3 platform firmware. This may be visible in /proc/cpuinfo, dmesg, bootloader output, or vendor firmware information.Affected if The system is running any of the listed Qualcomm firmware products (Fastconnect 6700/6900/7800, Qcm5430/6490, Qcs5430/6490, or Vc3 platform)
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Locate the image encoding IOCTL interfaceSearch for IOCTL handler code or kernel modules related to image encoding processing on the firmware. Review driver source code or binary firmware images for IOCTL call entry points handling image operations.Affected if The firmware contains an IOCTL interface for image encoding processing that accepts buffer parameters
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Verify buffer length validation existsExamine the IOCTL handler code for the image encoding path. Look for validation logic that checks the input buffer length (or zero-length condition) before passing the buffer to processing routines. This may require firmware binary analysis or source code review.Affected if There is no explicit check to reject or safely handle zero-length input buffers before they are processed in the image encoding IOCTL handler
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Check for exploitation indicatorsReview system logs, kernel logs, or firmware debug logs for signs of memory corruption events, unexpected crashes, or privilege escalation attempts related to image encoding IOCTL calls. Look for anomalous memory access patterns or service restarts.Affected if There are log entries or crash dumps indicating memory corruption occurring during image encoding IOCTL operations
A system is affected if it runs any of the listed Qualcomm firmware products and exposes an IOCTL interface for image encoding processing without proper zero-length buffer validation.
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 dataImplement proper input validation to ensure buffer length is non-zero before processing in IOCTL handlers. Add bounds checking and defensive programming to handle zero-length buffer edge cases safely.
- Consultation3.0 h
- Implementation4.0 h
- Testing4.0 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 $3,648.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21469 — 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-2025-21469 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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