SEPTEMBER 18, 2026
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Case File

CVE-2026-78408

HIGH · CVSS 7.9 EPSS 0.11% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-02 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability allows unprivileged users to exploit the nsenter --join-cgroup option, which opens the target cgroup.procs file as root and retains that access across namespace and credential changes. This can lead to unauthorized migration and termination of unrelated root processes, posing a significant risk to system integrity. Organizations utilizing containerized environments or multi-tenant systems should prioritize addressing this vulnerability to mitigate potential privilege escalation and process manipulation risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-78408
Severity
HIGH
CVSS
7.9
EPSS
0.11%

Original NVD 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.