CVE-2026-45838

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

bpf: fix end-of-list detection in cgroup_storage_get_next_key()

list_next_entry() never returns NULL -- when the current element is the

last entry it wraps to the list head via container_of(). The subsequent

NULL check is therefore dead code and get_next_key() never returns

-ENOENT for the last element, instead reading storage->key from a bogus

pointer that aliases internal map fields and copying the result to

userspace.

Replace it with list_entry_is_head() so the function correctly returns

-ENOENT when there are no more entries.