Metrics
Affected Vendors & Products
No advisories yet.
Solution
No solution given by the vendor.
Workaround
Upgrade to util-linux v2.41.6, v2.42.3, or later. Until a fix is applied, do not run nsenter --join-cgroup (including nsenter --target PID --all --join-cgroup) against untrusted processes or namespaces. The fix closes the cgroup.procs descriptor immediately after joining, and opens it with O_CLOEXEC.
Thu, 03 Sep 2026 16:45:00 +0000
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| First Time appeared |
Linux
Linux util-linux Redhat hardened Images Redhat openshift Container Platform |
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| Vendors & Products |
Linux
Linux util-linux Redhat hardened Images Redhat openshift Container Platform |
Thu, 03 Sep 2026 13:00:00 +0000
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Thu, 03 Sep 2026 12:15:00 +0000
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| Metrics |
threat_severity
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threat_severity
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Wed, 02 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority | |
| First Time appeared |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat openshift |
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| Weaknesses | CWE-775 | |
| CPEs | cpe:/a:redhat:hummingbird:1 cpe:/a:redhat:openshift:4 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat openshift |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-09-03T12:50:51.689Z
Reserved: 2026-08-24T14:40:14.511Z
Link: CVE-2026-78408
No data.
Status : Awaiting Analysis
Published: 2026-09-02T16:17:23.687
Modified: 2026-09-03T18:12:56.407
Link: CVE-2026-78408
OpenCVE Enrichment
Updated: 2026-09-03T16:27:19Z