CVE-2021-33640: libtar: fixes for CVE-2021-33645 and CVE-2021-33646 introduced new use-after-free bugs in libtar

Severity: Critical

CVSS Score: 9.8

After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).