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

bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE

bpf_prog_attach uses attach_type_to_prog_type to enforce proper
attach type for BPF_PROG_TYPE_CGROUP_SKB. link_create uses
bpf_prog_get and relies on bpf_prog_attach_check_attach_type
to properly verify prog_type <> attach_type association.

Add missing attach_type enforcement for the link_create case.
Otherwise, it's currently possible to attach cgroup_skb prog
types to other cgroup hooks.

kernel.org https://git.kernel.org/stable/c/543576ec15b17c0c93301ac8297333c7b6e84ac7 [No types assigned]

kernel.org https://git.kernel.org/stable/c/6675c541f540a29487a802d3135280b69b9f568d [No types assigned]

kernel.org https://git.kernel.org/stable/c/67929e973f5a347f05fef064fea4ae79e7cdb5fd [No types assigned]

kernel.org https://git.kernel.org/stable/c/b34bbc76651065a5eafad8ddff1eb8d1f8473172 [No types assigned]