# CVE-2026-78408

## Summary

- **CVE ID:** CVE-2026-78408
- **Severity:** HIGH
- **CVSS Score:** 7.9 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H)
- **CWE:** CWE-775
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 5, 2026

## 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

- Red Hat — Red Hat Hardened Images (2.42.2-3.4.hum1)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-78408)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2522497)
- [CNA](https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj)
- [CNA](https://access.redhat.com/errata/RHSA-2026:63162)
- [CVE](http://www.openwall.com/lists/oss-security/2026/09/05/2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.11%
- **EPSS Percentile:** 1.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._