CVE-2026-64275 Input: elan_i2c - prevent division by zero and arithmetic underflow
A malicious or faulty Elan I2C touchpad device can cause a kernel panic via division by zero or integer underflow during driver initialization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64275?
CVE-2026-64275 is a medium-severity vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-369
Which versions are affected by CVE-2026-64275?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64275?
Apply the vendor's patch.
Is CVE-2026-64275 being exploited?
There is no known exploitation of CVE-2026-64275 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93578, BELL-CVE-2026-64275, DEBIAN-CVE-2026-64275, GHSA-742p-q3m8-x43j, ROOT-OS-UBUNTU-2204-CVE-2026-64275, UBUNTU-CVE-2026-64275.