CVE-2026-784087.9HighCWE-775

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

Red Hat · Red Hat Enterprise Linux 10

Vendor fix available · Affected: Red Hat Enterprise Linux 10 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.2%probability of exploitation in the next 30 days

14th percentile

050100

Higher than 14% of scored CVEs

7.9HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products11

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Red Hat · Red Hat Enterprise Linux 10Versions not stated
Red Hat · Red Hat Cost Management On-Premise 1Versions not stated
Red Hat · Red Hat Hardened ImagesVersions not stated
Red Hat · Red Hat Enterprise Linux 7Versions not stated
Red Hat · Red Hat Enterprise Linux 8Versions not stated
Red Hat · Red Hat Enterprise Linux 9Versions not stated
Red Hat · Red Hat Enterprise Linux 9Versions not stated
Red Hat · Red Hat Enterprise Linux 9Versions not stated
Red Hat · Red Hat OpenShift Container Platform 4Versions not stated
Red Hat · Red Hat OpenShift Container Platform 4Versions not stated
Red Hat · Red Hat OpenShift Container Platform 5Versions not stated

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Missing Release of File Descriptor or Handle after Effective Lifetime · Denial of Service
Vendor: Red Hat
Published: September 2026
Band: Unlikely (under 1%), September 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-78408 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.