Somalia’s food insecurity has been exacerbated by drought, which isn’t a political instability, but it can easily cause instability in a country. The political instability that is exacerbating the food instability is the civil war. Wars are nasty things, in terms of what they can do to the countries involved.
Somalia is being ravaged by a civil war in a time of drought, so not only are the civilians starving, but those who are fighting on both sides are starving and dying of dehydration. A civil war, furthermore, ravages the entire political system in the country. If the government isn’t completely overthrown, it is worn out, ragged, and usually completely unwilling to deal with the problems that arise from the infighting between the winning and the losing side.