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.

The fix for this issue ensures that even in the case of allocation failure, hashtab_init() leaves behind a valid empty hash table, preventing the null pointer dereference and improving the stability of SELinux in this context​

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.