CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of fragmented frames in the devmap feature, specifically during packet cloning for XDP (eXpress Data Path) operations. An attacker could exploit this flaw to trigger an out-of-bounds access, potentially leading to system crashes or arbitrary code execution. Organizations using Linux in environments that leverage XDP for high-performance packet processing should prioritize patching this critical vulnerability to mitigate the associated risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented frames in devmap Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.