CVE-2026-78408

LOWCVSS 7.9 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-775

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Full discourse1 post

Upwind Security MDR@UpwindMDR17h
🚨High - util-linux nsenter FD leak enables root cgroup migration (CVE-2026-78408) util-linux nsenter with --join-cgroup opens target cgroup.procs as root but doesn’t close the FD across later setns/credential changes and execve(). Inherited attacker-controlled code keeps root creds on that FD, allowing cgroup moves of host processes and killing unrelated root services. Runs without --join-cgroup aren’t affected. 👉Affected: util-linux (nsenter --join-cgroup)
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