CVE-2026-112258 Gimp: gimp: use-after-free in xcf loader via prop_linked and prop_selection on channels

A flaw was found in GIMP. The XCF loader can leave a dangling pointer in the linked-channels list when a linked channel is later destroyed via a selection property. Opening a crafted XCF file can cause a use-after-free in the main GIMP process, leading to a crash and potentially arbitrary code...