Published: 19 September 2022
The Linux-PAM package before 1.5.2-6.1 for openSUSE Tumbleweed allows authentication bypass for SSH logins. The pam_access.so module doesn't correctly restrict login if a user tries to connect from an IP address that is not resolvable via DNS. In such conditions, a user with denied access to a machine can still get access. NOTE: the relevance of this issue is largely limited to openSUSE Tumbleweed and openSUSE Factory; it does not affect Linux-PAM upstream.
it was stated that upstream is not affected, so, Ubuntu might not be affected as well, it worth checking
Cvss 3 Severity Score
Launchpad, Ubuntu, Debian
Severity score breakdown