Description
The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Red Hat Red Hat Hardened Images
Default version status: affected
2.42.2-3.4.hum1 to < *unaffected
Red Hat Red Hat Enterprise Linux 10
Default version status: affected
Red Hat Red Hat Enterprise Linux 7
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: unaffected
Red Hat Red Hat OpenShift Container Platform 4
Default version status: unaffected
Red Hat Red Hat OpenShift Container Platform 4
Default version status: unaffected