CVE-2018-20787
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 · uneditedThe ft5x46 touchscreen driver for custom Linux kernels on the Xiaomi perseus-p-oss MIX 3 device through 2018-11-26 has an integer overflow and OOPS because of missing checks of the size argument in tpdbg_write in drivers/input/touchscreen/ft5x46/ft5x46_ts.c. This is exploitable for a device crash via a syscall by a crafted application on a rooted device.
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 · high confidenceInteger overflow vulnerability in the ft5x46 touchscreen driver's tpdbg_write function in drivers/input/touchscreen/ft5x46/ft5x46_ts.c on Xiaomi MIX 3 devices. Missing bounds validation on the size argument allows a rooted device user to trigger an OOPS (kernel panic) via a crafted syscall application.
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 data<= 2018-11-26CVSS 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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 device modelCheck if the device is Xiaomi MIX 3 (codename Perseus) by reviewing /sys/firmware/devicetree/base/model or running 'getprop ro.product.device' and 'getprop ro.product.name'Affected if Device model matches Xiaomi MIX 3 or Perseus codename
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Determine kernel build dateCheck the kernel build date via 'uname -a' output or by inspecting /proc/version; compare the build timestamp to 2018-11-26Affected if Kernel build date is on or before 2018-11-26
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Verify ft5x46 touchscreen driver presenceCheck if the ft5x46 touchscreen driver is loaded by examining 'ls /sys/bus/platform/drivers/ft5x46' or checking 'cat /proc/devices' for ft5x46-related entriesAffected if The ft5x46 touchscreen driver is present in the kernel
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Confirm root access availabilityVerify if the device has root access by attempting 'su -c id' or checking for su binary presence in /system/xbin/ or /system/bin/Affected if Root access is available on the device (required for exploitation)
The environment is affected if it is a Xiaomi MIX 3 device with a kernel build date on or before 2018-11-26 that has the ft5x46 touchscreen driver loaded and supports root access.
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 dataVendor (Xiaomi) or custom kernel maintainers should add proper size validation checks in tpdbg_write before copying data to prevent integer overflow. Users should apply kernel updates from official Xiaomi firmware channels.
- Consultation3.0 h
- Implementation2.0 h
- Testing8.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-20787 — 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-2018-20787 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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