CVE-2026-21376
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 in a camera sensor driver.
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 confidenceThis is a memory corruption vulnerability in a camera sensor driver where the IOCTL handler accesses an output buffer without first validating its size. An attacker could send a specially crafted IOCTL request with an undersized buffer, causing the driver to write beyond buffer boundaries and corrupt memory.
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 camera or wireless components in useExamine system hardware information, device tree, or kernel modules for presence of Aqt1000, Cologne, Fastconnect 6200/6700/6800/6900, Wcd9341, or Wcd9370 firmware/driver components. On Linux, check /sys/devices or kernel module listings (lsmod).Affected if Any of these Qualcomm components (Aqt1000, Cologne, Fastconnect series, Wcd9341, Wcd9370) are present in the system
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Verify camera sensor driver is loadedCheck for loaded camera sensor driver modules. On Linux, use 'lsmod | grep -i camera' or check /dev/video* nodes. For Wcd9341/Wcd9370/Aqt1000, look for associated V4L2 or camera subdevice drivers.Affected if Camera sensor driver for the affected Qualcomm components is loaded and active
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Verify wireless driver is loadedCheck for loaded wireless drivers. On Linux, use 'lsmod | grep -i wifi' or 'iw list'. For Fastconnect variants (6200/6700/6800/6900) and Cologne, look for Qualcomm wireless or Wi-Fi driver modules.Affected if Wireless driver for the affected Qualcomm Fastconnect or Cologne components is loaded and active
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Check IOCTL interface exposureExamine the driver's IOCTL handler accessibility. Determine if the camera or wireless driver IOCTL interface is exposed to userspace applications or untrusted processes. Look at device file permissions in /dev/ (e.g., /dev/video*) or check driver configuration.Affected if The IOCTL interface for the affected driver is accessible to non-privileged users or untrusted applications
A system is affected if it contains any of the listed Qualcomm components (Aqt1000, Cologne, Fastconnect 6200/6700/6800/6900, Wcd9341, Wcd9370) with the driver IOCTL interface accessible to userspace, as all firmware versions of these components lack the required 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 dataThe fix requires adding proper buffer size validation in the IOCTL handler before any buffer access operations. The driver must check that the user-provided buffer size meets the minimum requirements for the requested operation.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-21376 — 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-2026-21376 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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- Version or environment caveats, and links to real fixes
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