The below image is from ST micro document. The document says
"A negative injection current on any analog pin (or a closely positioned digital input pin) may introduce leakage current into the ADC input. The worst case is the adjacent analog channel. A negative injection current is introduced when VAIN < VSS, causing current to flow out from the I/O pin."
I understood how injection current is generated. But may I know how this injection current causes a leakage current in the adjacent channel.