CVE-2026-64275
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Elan I2C touchpad driver, missing validation of x_traces and y_traces can lead to division by zero and kernel panic. Additionally, an arithmetic underflow in touch reporting logic when width is less than 90 causes a huge unsigned integer to be reported to userspace.
Risk Assessment
The vulnerability can cause kernel panic (DoS) or report incorrect touch data to userspace, which could be exploited for attacks.
Recommendation
Apply the kernel patch that adds checks for zero x_traces/y_traces and clamps the width to a minimum of 0.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Input: elan_i2c - prevent division by zero and arithmetic underflow The Elan I2C touchpad driver queries the device for its physical dimensions and trace counts to calculate the device resolution and width. However, if the device firmware or device tree provides invalid zero values for x_traces or y_traces, it results in a fatal division-by-zero exception leading to a kernel panic during device probe. Add checks to ensure these parameters are non-zero before performing the division. If invalid trace values are detected, fall back to a safe default of 1. Additionally, prevent an arithmetic underflow in the touch reporting logic. Previously, if the calculated or fallback width was smaller than ETP_FWIDTH_REDUCE (90), the subtraction would underflow, resulting in a massive unsigned integer being reported to userspace. Clamp the adjusted width to a minimum of 0 to safely handle small physical dimensions and fallback scenarios. Completing the probe with safe fallback values ensures the sysfs nodes are created, keeping the firmware update path intact so a recovery firmware can be flashed to the device.