CVE-2026-21375
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 when accessing an output buffer without validating its size during IOCTL processing.
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 exists due to missing size validation when accessing an output buffer during IOCTL (I/O Control) request processing. An attacker can potentially trigger the vulnerability by sending specially crafted IOCTL requests with insufficient output buffer sizes, leading to memory corruption and possible privilege escalation.
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 chip modelCheck system information, kernel logs, or device firmware metadata to determine the exact Qualcomm chip model (e.g., Wcn3988, Wsa8830, Wsa8832, Wsa8835, Wsa8840, Wsa8845, Wsa8845h, or X2000077)Affected if The chip model matches any of the affected products: Wcn3988, Wsa8830, Wsa8832, Wsa8835, Wsa8840, Wsa8845, Wsa8845h, or X2000077
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Determine firmware versionRead the firmware version string from the device (via dmesg, /sys/firmware, or vendor diagnostic tools) and compare against 'all versions' - note that the vendor lists all versions as affectedAffected if Any firmware version is present on the identified affected chip model
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Verify IOCTL interface is exposedCheck if the device exposes IOCTL interfaces for the wireless/audio subsystem (look for /dev/wcn* or similar device nodes, or check driver configuration for IOCTL support)Affected if IOCTL interfaces are accessible and the affected firmware is in use
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Check for vendor-specific IOCTL handlersInspect the driver or firmware configuration to confirm IOCTL handlers exist for the Qualcomm chip (this is typically built into the firmware)Affected if IOCTL handlers are present in the firmware for the affected chip model
If your device uses any Qualcomm firmware variant among Wcn3988, Wsa8830, Wsa8832, Wsa8835, Wsa8840, Wsa8845, Wsa8845h, or X2000077 with IOCTL functionality enabled, the environment is affected since all versions of these firmwares lack proper buffer size 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 buffer size validation in all IOCTL handlers before accessing output buffers; ensure the provided buffer size meets minimum requirements and does not exceed allocated buffer space.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 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 $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21375 — 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-2026-21375 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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