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Vulnerability Change Records for CVE-2021-47218

Change History

New CVE Received by NIST 4/10/2024 3:15:48 PM

Action Type Old Value New Value
Added Description

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

selinux: fix NULL-pointer dereference when hashtab allocation fails

When the hash table slot array allocation fails in hashtab_init(),
h->size is left initialized with a non-zero value, but the h->htable
pointer is NULL. This may then cause a NULL pointer dereference, since
the policydb code relies on the assumption that even after a failed
hashtab_init(), hashtab_map() and hashtab_destroy() can be safely called
on it. Yet, these detect an empty hashtab only by looking at the size.

Fix this by making sure that hashtab_init() always leaves behind a valid
empty hashtab when the allocation fails.
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79 [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fab [No types assigned]
Added Reference

								
							
							
						
kernel.org https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b [No types assigned]