CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's BPF (Berkeley Packet Filter) subsystem, specifically allowing an exclusive map to be inserted into a non-exclusive outer map, which can then be accessed and modified by unrelated programs. This bypasses the exclusivity guarantees intended to protect the integrity of the maps, potentially leading to unauthorized access and manipulation of sensitive data. Organizations using Linux systems with BPF functionality should prioritize addressing this vulnerability to mitigate risks associated with unauthorized program interactions.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject exclusive maps as inner maps in map-in-map An exclusive map (created with excl_prog_hash) is bound to a single program by hash: check_map_prog_compatibility() refuses to load any program whose digest does not match map->excl_prog_sha. That check only runs for maps a program references directly, i.e. its used_maps. A map reached at runtime through a map-of-maps is never in used_maps, and bpf_map_meta_equal() does not consider excl_prog_sha, so an exclusive map can be inserted into a non-exclusive outer map and then looked up and mutated by an unrelated program, bypassing the exclusivity guarantee. For the signed loader this defeats the metadata map exclusivity check added in the signed loader: the cached map->sha[] is validated against the signed hash while another program on a hostile host rewrites the frozen map's contents through the outer map.