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7.9 High

CVE-2026-78408 Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority

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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H

Exploitable with local access to the machine, with an ordinary account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
Interaction
Required
Scope
Changed
Confidentiality
None
Integrity
High
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Hardened Images 2.42 earliest → < 2.42.2-3.4.hum1 2.42.2-3.4.hum1
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat OpenShift Container Platform 5 Versions not published
Red Hat Cost Management On-Premise 1 1793825318 earliest → < 1793825318 1793825318

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