Arch Linux Security Advisory ASA-202107-57 ========================================== Severity: Medium Date : 2021-07-21 CVE-ID : CVE-2021-33910 Package : systemd Type : denial of service Remote : No Link : https://security.archlinux.org/AVG-2179 Summary ======= The package systemd before version 249.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 249.1-1. # pacman -Syu "systemd>=249.1-1" The problem has been fixed upstream in version 249.1. Workaround ========== None. Description =========== A denial of service security issue has been found in systemd before version 249.1. A local attacker who is able to mount a filesystem with a very long path can crash systemd and the whole system through an attacker-controlled alloca(). Impact ====== A local unprivileged attacker who is able to mount a filesystem with a very long path can crash systemd and therefore the whole system. References ========== https://www.qualys.com/2021/07/20/cve-2021-33910/denial-of-service-systemd.txt https://www.qualys.com/2021/07/20/cve-2021-33910/cve-2021-33910-crasher.c https://bugzilla.redhat.com/show_bug.cgi?id=1970887 https://github.com/systemd/systemd/pull/20256 https://github.com/systemd/systemd/commit/441e0115646d54f080e5c3bb0ba477c892861ab9 https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce https://security.archlinux.org/CVE-2021-33910