CVE-2026-64236

Summary

In the Linux kernel, the following vulnerability has been resolved:

i2c: davinci: fix division by zero on missing clock-frequency

When the 'clock-frequency' property is missing from the device tree, the driver falls back to DAVINCI_I2C_DEFAULT_BUS_FREQ. However, this macro was defined in kHz (100), whereas the device tree property is expected in Hz.

The probe function divided the fallback value by 1000, causing integer truncation that resulted in dev->bus_freq = 0. This triggered a deterministic division-by-zero kernel panic when calculating clock dividers later in the probe sequence.

Fix this by redefining DAVINCI_I2C_DEFAULT_BUS_FREQ in Hz (100000) to match the expected device tree property unit, allowing the existing division logic to work correctly for both cases.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb04ce63859793e3439b394976b8d29e785d4d69a < 3f43865cb64dd7cb50efae1281a95585617b12a1affected
LinuxLinuxb04ce63859793e3439b394976b8d29e785d4d69a < 9b694bc0e1831cbc5c3bbfd1b156ec719128f7d9affected
LinuxLinuxb04ce63859793e3439b394976b8d29e785d4d69a < 030675aa54cf757769b3db65642433d626b3ed7caffected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References