CVE-2022-0667

An assertion check flaw was found in BIND, with a refactoration of recursive client code that introduced a “backstop lifetime timer.” While BIND processes a request for a DS record that needs to be forwarded, it waits until this processing is complete or until the backstop lifetime timer has timed out. As a result of this timeout, the resume_dslookup() function is called, which does not test whether the fetch has shut down previously. This issue triggers an assertion failure, which could cause the BIND process to terminate.