CVE-2021-47218

A vulnerability was found in the Linux kernel, related to SELinux. This issue occurs when a hash table allocation fails during the hashtab_init() function. When this failure happens, the system leaves the hash table (h->size) initialized with a non-zero value, but the h->htable pointer remains null. This can result in a null pointer dereference when SELinux’s policy database tries to use the hash table, relying on the assumption that it is valid. This situation can cause system crashes or unexpected behavior.