What is the liability of a private landowner for injuries sustained by a trespasser while trespassing on a private property?

Cal. Civil Code 846. Section 846 immunizes California landowners of two duties: "the duty to 'keep the premises safe' for recreational users, and the duty to warn such users of 'hazardous conditions, uses of, structures, or activities' on the premises." Klein v. United States, 50 Cal. 4th 68, 78 (2010). Under section 846, private landowners are afforded "a substantial measure of immunity from liability for injured incurred by those entering or using their land for recreational purposes." Termini v. United States, 963 F.2d 1264, 1265 (9th Cir. 1992).