CVE-2025-21456
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 IOCTL command when multiple threads are called to map/unmap buffer concurrently.
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 kernel-mode driver IOCTL command handling due to race conditions when multiple threads concurrently map/unmap buffers, leading to potential use-after-free or similar memory corruption issues.
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 Qualcomm network componentsRun 'lspci' or 'lsusb' to list network adapters, or check system information for Qualcomm Fastconnect, Ar8035, or other listed componentsAffected if Any of the listed Qualcomm products (Ar8035, C V2x 9150, Fastconnect 6900/7800, Qam8255p/8295p/8650p/8775p) appear in the hardware inventory
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Check driver versionUse 'ethtool -i <interface>' for Ethernet adapters, or check the kernel module info via 'modinfo <module_name>' for Qualcomm network driversAffected if The driver version cannot be determined or matches an unpatched firmware version from the affected product list
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Verify IOCTL interface availabilityCheck if the Qualcomm driver IOCTL interface is exposed by examining /dev or /proc entries related to the network driver, or by using 'ls -la /sys/class/net/' to identify the network interfaceAffected if The network interface uses a Qualcomm driver and the IOCTL path exists in /proc or /dev
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Check for concurrent driver accessMonitor system for processes or threads that interact with the Qualcomm network driver IOCTL interface concurrently using 'lsof' or 'fuser' on network interfacesAffected if Multiple processes or threads are observed accessing the same Qualcomm network driver interface simultaneously
If your system contains any of the listed Qualcomm firmware products (Ar8035, C V2x 9150, Fastconnect 6900/7800, Qam8255p/8295p/8650p/8775p) and uses the corresponding driver IOCTL interface, you are likely affected since all versions of these products are vulnerable.
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 vendor-provided patch/update to the affected driver; implement proper synchronization primitives (locks/mutexes) for buffer map/unmap operations in the IOCTL handler.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,776.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21456 — 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-2025-21456 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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