In the Linux kernel, the following vulnerability has been resolved: bpf: Add BPFPROGTYPECGROUPSKB attach type enforcement in BPFLINKCREATE bpfprogattach uses attachtypetoprogtype to enforce proper attach type for BPFPROGTYPECGROUPSKB. linkcreate uses bpfprogget and relies on bpfprogattachcheckattachtype to properly verify progtype <> attachtype association. Add missing attachtype enforcement for the linkcreate case. Otherwise, it's currently possible to attach cgroup_skb prog types to other cgroup hooks.