PHP is vulnerable to privilege escalation. When running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
www.openwall.com/lists/oss-security/2021/10/26/7
bugs.php.net/bug.php?id=81026
lists.debian.org/debian-lts-announce/2021/10/msg00021.html
lists.fedoraproject.org/archives/list/[email protected]/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
lists.fedoraproject.org/archives/list/[email protected]/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
lists.fedoraproject.org/archives/list/[email protected]/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
secdb.alpinelinux.org/edge/community.yaml
secdb.alpinelinux.org/v3.14/community.yaml
security.gentoo.org/glsa/202209-20
security.netapp.com/advisory/ntap-20211118-0003/
www.debian.org/security/2021/dsa-4992
www.debian.org/security/2021/dsa-4993
www.oracle.com/security-alerts/cpuapr2022.html
www.oracle.com/security-alerts/cpujan2022.html