Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat Hardened Images | unaffected 2.42.2-3.4.hum1 before * |
| Red Hat / Red Hat Enterprise Linux 10 | affected |
| Red Hat / Red Hat Enterprise Linux 7 | unaffected |
| Red Hat / Red Hat Enterprise Linux 8 | unaffected |
| Red Hat / Red Hat Enterprise Linux 9 | unaffected |
| Red Hat / Red Hat Enterprise Linux 9 | unaffected |
| Red Hat / Red Hat Enterprise Linux 9 | unaffected |
| Red Hat / Red Hat OpenShift Container Platform 4 | unaffected |
| Red Hat / Red Hat OpenShift Container Platform 4 | unaffected |
CWE
CWE-775
References
- https://access.redhat.com/errata/RHSA-2026:63162
- https://access.redhat.com/security/cve/CVE-2026-78408
- https://bugzilla.redhat.com/show_bug.cgi?id=2522497
- https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj
ADP enrichment
No English description supplied.
No English description supplied.