CVE-2026-74360

In the Linux kernel, the following vulnerability has been resolved:

bpf: Reject exclusive maps for bpfmapelem iterators

Exclusive maps (aka exclproghash) are meant to be reachable only from the single program whose hash matches. This is enforced by checkmapprog_compatibility() when the map is referenced from a program such as signed BPF loaders.

A bpfmapelem iterator, however, binds its target map at attach time in bpfiterattach_map() instead of referencing it from the program, so the exclusivity check is never reached. On top of that, the iterator exposes the map value as a writable buffer.